Calculate ΔH∘ in kilojoules for the reaction of ammonia (ΔH∘f=−46.1 kJ/mol) with O2 to yield nitric oxide NO (ΔH∘f=91.3 kJ/mol) and H2O(g) (ΔH∘f=−241.8 kJ/mol), a step in the Ostwald process for the commercial production of nitric acid.,

Answers

Answer 1

Final answer:

The standard enthalpy change (ΔH°) for the reaction of ammonia with O2 to yield nitric oxide and H2O(g) is calculated using standard enthalpies of formation and is found to be -633.2 kJ.

Explanation:

To calculate the standard enthalpy change (ΔH°) for the reaction of ammonia (NH3) with O2 to yield nitric oxide (NO) and H2O(g), we can use the standard enthalpies of formation (ΔH°f) for the reactants and products. Unfortunately, the provided information contains several elements that are not relevant to this question. Let us use the correct ΔH°f values to find the ΔH° for this reaction. Assuming we have balanced the equation and it is:

4NH3(g) + 5O2(g) → 4NO(g) + 6H2O(g)

The formula to calculate ΔH° is:

ΔH° = [∑ (ΔH°f products) × (moles of product)] - [∑ (ΔH°f reactants) × (moles of reactant)]

Using the values given for ΔH°f:

ΔH°f NH3 = -46.1 kJ/mol
ΔH°f NO = 91.3 kJ/mol
ΔH°f H2O(g) = -241.8 kJ/mol

For the reaction:

ΔH° = [4×91.3 kJ/mol + 6×(-241.8 kJ/mol)] - [4×(-46.1 kJ/mol) + 5×0 kJ/mol]

ΔH° = (365.2 kJ - (-1448.8 kJ)) - (-184.4 kJ + 0 kJ)

ΔH° = -817.6 kJ + 184.4 kJ

ΔH° = -633.2 kJ

Therefore, the standard enthalpy change for the reaction is -633.2 kJ.


Related Questions

. Calculate the masses of Ca(NO3)2•4H2O(s) and KIO3(s) required to make 10.0 g of Ca(IO3)2(s)

Answers

Answer: 6.1 g of Ca(NO₃)₂•4H₂O and 5.5 g of KIO₃


Explanation:


1) Calculate the number of moles of Ca(NO₃)₂ in 10.0 g


i) molar mass of Ca(NO₃)₂ = 40.1 g/mol + 2x126.9 g/mol + 2x3x16.0 g/mol = 389.9 g/mol


ii) Formula: number of moles = mass in grams / molar mass


number of moles = 10.0 g / 389.9 g/mol = 0.02565 moles of Ca(NO₃)₂


2) Write the chemical equation to state the mole ratio:


i) Ca(NO₃)2•4H₂O(s) + 2KIO₃(s) --> Ca(IO₃)₂(s) + 2KNO₃ + 4H₂O


ii) mole ratio: 1 mol Ca(NO₃)2•4H₂O(s) : 2 mol KIO₃(s) : 1 mol Ca(IO₃)₂(s)


3) Use proportionality to find the actual number of moles


i) Ca(NO₃)₂•4H₂O(s)

1 mol Ca(NO₃)₂•4H₂O(s) / 1 mol Ca(IO₃)₂ = x / 0.02565 mol Ca(IO₃)₂ => x = 0.02565 mol Ca(NO₃)₂•4H₂O(s)


molar mass of Ca(NO₃)₂•4H₂O(s) = 40.0g/mol + 2x14.0g/mol + 2x3x16.0g/mol + 4x18.0g/mol = 236.0g/mol


mass in grams = number of moles x molar mass = 0.02565 mol x 236.0 g/mol = 6.1 g


ii) KIO₃


1mol KIO₃/1molCa(IO₃)₂ = x / 0.02565 mol Ca(IO₃)₂ => x = 0.02565 mol KIO₃


molar mas of KIO₃ = 39.1 g/mol + 126.9 g/mol + 3x16.0 g/mol = 214.0 g/mol


mass in grams = 0.02565 mol x 214.0 g/mol = 5.5 g

Answer:  The masses of [tex]Ca(NO_3)_2.4H_2O[/tex] and [tex]KIO_3[/tex] required to make 10.0 g of [tex]Ca(IO_3)_2[/tex] is 5.9 and 10.7 grams respectively.

Explanation: To calculate the moles, we use the equation:

[tex]\text{Number of moles}=\frac{\text{Given mass}}{\textMolar mass}}[/tex]

[tex]\text{Number of moles}=\frac{10.0g}{390 g/mol}=0.025moles[/tex]

[tex]Ca(NO_3)_2.4H_2O(s)+2KIO_3(s)\rightarrow Ca(IO_3)_2+2KNO_3+4H_2O[/tex]

1 mole of [tex]Ca(IO_3)_2[/tex] is formed from 1 mole of [tex]Ca(NO_3)_2.4H_2O[/tex] and 2 moles of [tex]KIO_3[/tex]

Thus 0.025 moles of [tex]Ca(IO_3)_2[/tex] is formed from 0.025 moles of [tex]Ca(NO_3)_2.4H_2O[/tex] and 0.05 moles of [tex]KIO_3[/tex]

Mass of [tex]Ca(IO_3)_2.4H_2O=moles\times {\text {Molar mass}}=0.025\times 236=5.9 grams[/tex]

Mass of [tex]KIO_3=moles\times {\text {Molar mass}}=0.05\times 214=10.7grams[/tex]

A solution is 0.30 m in nh3. what concentration of nh4cl would be required to achieve a buffer solution with a final ph of 9.0? recall the hh equation can be written using ph and pka or poh and pkb. the kb of nh3 is 1.8 x 10–5.

Answers

- first, we have to get POH. 
and when we have PH = 9 so,
PH+POH = 14
POH = 14 -9 = 5 
- then by using this formula of PKa:
PKa = -㏒Kb and when we have Kb = 1.8x10^-5 so by substitution:
PKa   = - ㏒ 1.8x10^-5
∴PKa = 4.7
So know we have Pka & POH So by substitution in the following formula w can get the concentration:
POH = Pka + ㏒[HB]/[B}
5 = 4.7 + ㏒[HB]/[0.3]

∴[HB](NH4Cl) =0.599 m

To achieve a buffer solution with a pH of 9.0 using NH₃, the required concentration of NH₄Cl is approximately 0.55 M.

This is determined using the Henderson-Hasselbalch equation.

Key calculations involve finding the pKa and using logarithmic functions.

To determine the concentration of NH₄Cl required to achieve a buffer solution with a pH of 9.0, we use the Henderson-Hasselbalch equation. Given:

The concentration of NH₃ is 0.30 MThe pKb of NH₃ is calculated from the provided Kb (1.8 x 10⁻⁵)pKa of NH⁴⁺ = 14 - pKb

First, calculate pKb:

pKb = -log(1.8 x 10⁻⁵) ≈ 4.74

Then, calculate pKa:

pKa = 14 - pKb = 14 - 4.74 = 9.26

Using the Henderson-Hasselbalch equation:

pH = pKa + log([NH₃]/[NH₄Cl])

We need a pH of 9.0, so:

9.0 = 9.26 + log(0.30/[NH₄Cl])

Simplifying, we get:

-0.26 = log(0.30/[NH₄Cl])

Taking the antilog, we find:

0.30/[NH₄Cl] = 10^-0.26 ≈ 0.55

Therefore:

[NH₄Cl] = 0.30/0.55 ≈ 0.55 M

To achieve a buffer solution with a pH of 9.0, the concentration of NH₄Cl required is approximately 0.55 M.

The correct question is:

A solution is 0.30 m in NH₃. what concentration of NH₄Cl would be required to achieve a buffer solution with a final ph of 9.0? recall the hh equation can be written using pH and pkₐ or pOH and pkb. The kb of NH₃ is 1.8 x 10⁻⁵.

How much energy is required to ionize a hydrogen atom in its ground?

Answers

Your welcome for giving you the answer
An ionization energy of 2.18 × 10−18 joule (13.6 electron volts) is required to force the electron from its lowest energy level entirely out of the atom.

Hope this helps!! (If not sorry!)

For a given sample of ch3oh, the enthalpy change during the reaction is 82.3 kj . how many grams of methane gas are produced?

Answers

Final answer:

To find the number of grams of methane gas produced, use the enthalpy change and stoichiometry of the reaction. Assuming the reaction is the combustion of methane, calculate the moles of methane using the enthalpy change and convert it to grams.

Explanation:

To determine the number of grams of methane gas produced, we need to use the enthalpy change and stoichiometry of the reaction. From the given information, we know that the enthalpy change is 82.3 kJ. Since the reaction is not specified, we'll assume it's the combustion of methane:

CH4 + 2O2 -> CO2 + 2H2O

The stoichiometry of the reaction tells us that for every 1 mol of methane, we produce 1 mol of CO2. Therefore, the number of grams of methane can be calculated as follows:

Convert the enthalpy change from kJ to J: 82.3 kJ = 82,300 J Calculate the moles of methane using the enthalpy change: 82,300 J / -802 kJ/mol = -102.62 mol Convert the moles of methane to grams using the molar mass of methane (16 g/mol): -102.62 mol * 16 g/mol = -1642.96 g The negative sign indicates that the reaction is exothermic, meaning heat is released.

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Final answer:

Given an enthalpy change of 82.3 kJ during a reaction involving methanol (CH3OH), approximately 1.47 grams of methane (CH4) would be produced. This is derived by applying the principles of stoichiometric calculations and enthalpy changes, and considering the exothermic nature of the combustion reaction of methane.

Explanation:

To answer your question about how many grams of methane gas are produced given a sample of ch3oh (methanol) and an enthalpy change of 82.3 kJ, we need to apply the principles of stoichiometric calculations and enthalpy changes. In this problem, we can use a similar approach to what we would use in a stoichiometry problem.

First, it's important to note that the combustion reaction of methane (CH₄) is exothermic, meaning it releases energy. Specifically, the combustion of 1 mole of methane releases approximately 890.4 kJ of energy, as shown by the chemical reaction:

CH₄(g) + 2O₂(g) → CO₂(g) + 2H₂O(g) + 890.4 kJ

Given that the enthalpy change is 82.3 kJ, we can calculate the amount of methane combusted. We can convert the energy change from kJ to mol, using the known energy/reaction ratio of 890.4 kJ/mol, which gives us approximately 0.092 mol of CH₄. Subsequently, we can convert moles into grams using the molar mass of methane (16 g/mol). This gives the final answer of approximately 1.47 grams of methane.

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A 55.0-g piece of copper wire is heated, and the temperature of the wire changes from 19.0°C to 86.0°C. The amount of heat absorbed is 343 cal. What is the specific heat of copper? Show your work.

Answers

Q = mc(ΔT)
Q = 343
m = 55
ΔT = 86 - 19 = 67

343 = 55(c)(67)
343 = 3685c
c = 0.0931 J/(g * C)

Net-ionic equation for hydrolysis of ZnCl2

Answers

Final answer:

The net-ionic equation for hydrolysis of ZnCl in water typically produces zinc hydroxide and hydrogen ions, but the equation provided incorrectly represents a neutralization reaction.

Explanation:

The net-ionic equation for the hydrolysis of zinc chloride (ZnCl) in water involves the hydrolysis reaction where the Zn²+ cation reacts with water to produce a weak acid and the Zn(OH)₂ solid as the product.

However, the net-ionic equation presented here is incorrect for hydrolysis, as it represents a neutralization reaction.

In hydrolysis, the relevant products would involve zinc hydroxide as a precipitate and hydrogen ions or hydronium ions depending on the pH of the solution.

Graphite and iodine are non metals but they shine. Explain it with suitable reasons.

Answers

Final answer:

Graphite and iodine are shiny nonmetals due to their structure; graphite's free-moving electrons within layers give it a luster, while iodine's crystalline form reflects light. Both have unique bonding arrangements contributing to their reflective properties.

Explanation:

Graphite and iodine are both nonmetals that exhibit a shiny, lustrous appearance, which is a characteristic more typically associated with metals. The reason behind this lies in their unique structures and bonding arrangements.

Graphite, an allotrope of carbon, has a layered structure with delocalized electrons. These electrons are able to move freely within the layers, which not only gives graphite its electrical conductivity but also contributes to its shine. The carbon atoms within each layer are strongly bonded, but the layers themselves are held together by weaker forces, allowing them to slip past one another and giving graphite its lubricating properties.

Iodine, on the other hand, has a shiny surface due to its crystalline solid form. The structure allows it to reflect light, which gives the appearance of a metallic luster.

A particular coal contains 2.5% sulfur by mass. When this coal is burned, the sulfur is converted into sulfur dioxide gas. The sulfur dioxide reacts with solid calcium oxide to form solid calcium sulfite.

Answers

The balance equation is :
SO2 + CaO → CaSO3 

1.
(2100 tons) x (0.025 S) / (32.0655 g S/mol) x (1 mol SO2 / 1 mol S) x 
(1 mol CaO / 1 mol SO2) x (56.0778 g CaO/mol)
= 91.81 tons CaO 

2. (2100 tons) x (0.025 S) x (907185 g/ton) / (32.0655 g S/mol) x (1 mol SO2 / 1 mol S) x (1 mol CaSO3 / 1 mol SO2) x (120.1422 g CaSO3/mol)
= 1.784 x 10^8 g CaSO3

Although your question is incomplete I have provide more general answer is provided

The  Reaction equation between sulfur dioxide and solid calcium oxide :

[tex]SO_{2}_{(g)} + CaO_{(s)} ---> CaSO_{3}_{(s)}[/tex]

Given that your question is vague I have provided the reaction equation between the Sulphur dioxide and calcium oxide, and the chemical conversion equation of Sulphur to Sulphur dioxide ( gas )

conversion of Sulphur to Sulphur dioxide

= [tex]S_{(s)} + O_{(2)}_{(g)} ----> SO_{2}_{(g)}[/tex]

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In a mechanical clock, the swinging of a pendulum causes the hands to move. The diagram shows the path of the pendulum as it swings. At which point in its swing does the pendulum have the least gravitational potential energy?

Answers

The answer is Point C because it is the lowest point

Answer:

Point C

Explanation:

What is the symbol for the magnesium ion that forms when magnesium metal reacts with sulfur, s?

Answers

Mg2+ .................................

Answer: The magnesium ion formed is [tex]Mg^{2+}[/tex]

Explanation:

Magnesium is the 12th element of the periodic table having electronic configuration: [tex]1s^22s^22p^63s^2[/tex]. This element will easily loose 2 electrons and form [tex]Mg^{2+}[/tex] ion.

Sulfur is the 16th element of the periodic table having electronic configuration: [tex]1s^22s^22p^63s^23p^4[/tex]. This element will easily gain 2 electrons and form [tex]S^{2-}[/tex] ion.

Sulfur and magnesium will form ionic compound, which means that a complete transfer of electrons takes place from one element to another.The compound formed will be MgS (Magnesium sulfide).

Hence, the magnesium ion formed is [tex]Mg^{2+}[/tex]

A moving car powered by gasoline provides evidence of _____. chemical energy being converted into work gasoline being destroyed while energy is being created an endothermic reaction taking place potential energy being destroyed and heat energy being created

Answers

Chemical energy being converted into work. 
chemical energy being converted into work

in which direction will the following reaction go if the standard reduction potentials are 0.80 V for Ag/Ag+ and -0.44 V for Fe/Fe2+?,

Answers

The reaction shown in the equation Ag+ + Fe → Ag + Fe2+ will go in the forward direction. From the given standard reduction potentials, the reduction potential 0.80 V for Ag+ is more positive than the reduction potential -0.44 V for Fe2+. Therefore, Ag+ is strong enough to oxidize Fe to Fe2+. Also, reactions with a negative reduction potential will tend to run in reverse, which makes our claim more valid: that Fe will be oxidized to Fe2+.

Answer:forward

Explanation:

Dillon is conducting a survey about whether or not people like a traffic law that is being passed.Can he publish his findings as a scientific study because he collected information?

Answers

Using the scientific method, a researcher conducts a study in five phases: asking a question, researching existing sources, formulating a hypothesis, conducting a study, and drawing conclusions. Since Dillon only took a survey, I would say that while he did some research it is limited and is not classified as scientific.
I'm not certain, I am in Chemistry myself right now so I would get a second opinion...
Hope this helps nonetheless!:)

The answer is: No, because his information is subjective.

Survey about whether or not people like something is not objective (fact) and cannot be published.

The laws of science are statements that describe or predict a range of phenomena as they appear in nature.

Laws explain facts determined by experiment.

Laws do not have absolute certainty and be changed by future experiments and observations.

Suppose you have a spherical balloon filled with air at room temperature and 1.0 atm pressure; its radius is 17 cm. You take the balloon in an airplane, where the pressure is 0.87 atm. If the temperature is unchanged, what's the balloon's new radius?,

Answers

Answer: 17.8 cm


Explanation:


1) Since temperature is constant, you use Boyle's law:


PV = constant => P₁V₁ = P₂V₂


=> V₁/V₂ = P₂/P₁

2) Since the ballon is spherical:


V = (4/3)π(r)³

Therefore, V₁/V₂ = (r₁)³ / (r₂)³


3) Replacing in the equation V₁/V₂ = P₂/P₁:


(r₁)³ / (r₂)³ = P₂/P₁

And you can solve for r₂: (r₂)³ = (P₁/P₂) x (r₁)³


(r₂)³ = (1.0 atm / 0.87 atm) x (17 cm)³ = 5,647.13 cm³

r₂ = 17.8 cm

Answer:

The new radius of the balloon is 17.8 cm.

Explanation:

Initial pressure of the air in the balloon =[tex]P_1[/tex] 1.0 atm

Radius of the balloon ,r= 17 cm

Volume of the spherical volume balloon = [tex]V_1=\frac{4}{3}\pi r^3[/tex]

Final pressure of the air in balloon =[tex]P_2[/tex]=0.87 atm

Radius of the balloon be R

Volume of the balloon be = [tex]V_2=\frac{4}{3}\pi R^3[/tex]

New radius of the balloon= R

According Boyle's Law:

[tex]P_1V_1=P_2V_2[/tex]

[tex]1.0 atm\times \frac{4}{3}\pi r^3=0.87 atm\times \frac{4}{3}\pi R^3[/tex]

R =17.80 cm

The new radius of the balloon is 17.8 cm.

Which of the following statements is true?

Question 4 options:

In an endothermic reaction, the energy of the products is the same as the energy of the reactants.

In an exothermic reaction, the energy of the products is less than the energy of the reactants.

In an exothermic reaction, the energy of the products is the same as the energy of the reactants.

In an endothermic reaction, the energy of the products is less than the energy of the reactants.


give an explanaintion if you can

Answers

The first statement is False... as
For exothermic reaction :
A+B》 C+D + HEAT..(heat is considered as a product)... as for endo.. heat is a reactant.
So tjey can't be of the same energy...

2nd one...based on the
A+B》 C+D+HEAT...For exo reaction... the product have more Heat energy than potential...so its false
Recall...energy can nither be created nor destroyed but converted from one form to another....

The 4th one however is true for heat...the reactants have nore energy than the products..
A+B+HEAT》C+D

Which statement describes a property of covalent compounds?
They have a high boiling point because of strong intermolecular forces.
They have a low boiling point because of weak intermolecular forces.
They have a low melting point because of strong intermolecular forces.
They have a high melting point because of weak intermolecular forces.

Answers

b) They have a low boiling point because of the weak intermolecular forces.

Hope this helped!
They have a low boiling point because of weak intermolecular forces.

When co2 levels are low and o2 levels are high, rubisco adds an o2 molecule to rubp. what are the consequences of this reaction?

Answers

Final answer:

If CO2 levels are low and O2 levels are high, RuBisCO adds an O2 molecule to RuBP, not CO2. This process is known as photorespiration, which reduces the overall efficiency of photosynthesis by consuming plant energy and releasing CO2. It's a wasteful process compared to usual photosynthesis.

Explanation:

RuBisCO is an enzyme that plays a pivotal role in the process of photosynthesis by catalyzing a reaction between CO₂ and RuBP. However, when CO₂ levels are low and O₂ levels are high, RuBisCO adds an O₂ molecule to RuBP instead of CO₂. This process is known as photorespiration and leads to consequences in the Calvin cycle of photosynthesis.

In the scenario of low CO₂ and high O₂ levels, RuBisCO's oxygenase activity increases, reducing the amount of CO₂ that is fixed and thus reducing the overall efficiency of photosynthesis. The production of 3-phosphoglycerate (3-PGA) decreases, subsequently affecting the production of glucose. Instead of facilitating the production of valuable energy-rich compounds, photorespiration consumes energy and releases CO₂. Thus, it is a wasteful process for the plant.

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What would be a correct unit of measurement for velocity

Answers

velocity is in units of distance per unit of time. like meters per second (m/s) or miles per hour (mph)
For ANY measurement of velocity, there must be a distance unit divided by time.  So look at the units to see which ones meet that requirement, but in most scientific studies they revert to meters/second

(Please answer as quickly as possible for brainliest, thanks :))

What is the name of the group of elements that are human-made and do NOT occur in nature?

A- Actinides
B- Halogens
C- Noble gases
D- Nonmetals

Answers

A. actinides do not occur in nature.
Hello,

The answer is option A Actinides.

Reason:

The answer is Actinides because they are human made. Its not option B because some of those are minerals. Its not C because gases are caused by nature. Its also not D because nonmetals are also made by nature.

If you need anymore help feel free to ask me!

Hope this helps!

~Nonportrit

Adding heat to water results in a relatively small temperature change because

Answers

Answer:   Because water has a high specific heat capacity due to the hydrogen bonding within the H₂O molecules ;  so it takes a great deal of energy, or heat, to break these bonds— or to form them.
______________________________________________________

A calorie of heat causes a relatively little change in the temperature of water because most of the heat is consumed to break down hydrogen bonds before water molecules can start moving more quickly.

What is heat ?

The exchange of "thermal" energy brought on by a temperature differential is known as heat. Think of an isolated system with two subsystems that are initially operating at two distinct temperatures.

Since water has a higher specific heat than other substances, it requires more energy to raise its temperature. This is why using water as a coolant in your car's radiator and in several sectors is beneficial.

The heat required to raise the temperature of liquid water is considerable because hydrogen bonds between the molecules must be broken.

Thus, Heat is absorbed and released as hydrogen bonds form.

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A 130.0−mL sample of a solution that is 3.0×10−3M in AgNO3 is mixed with a 225.0−mL sample of a solution that is 0.14M in NaCN.
After the solution reaches equilibrium, what concentration of Ag+(aq) remains?,

Answers

Final answer:

This reaction practically goes to completion as AgCN is nearly insoluble, using up almost all of the Ag+, so practically no Ag+ remains.

Explanation:

The reaction between AgNO3 and NaCN results in the formation of AgCN, which is nearly insoluble. Due to this, the reaction practically goes to completion, consuming almost all the Ag+ ions.

The initial number of moles of Ag+ can be calculated as follows: volume (L) × molarity = 0.130 × 3.0×10−3 = 3.9×10−4 moles.

The initial number of moles of CN- (from NaCN) is: 0.225 × 0.14 = 0.0315 moles.

Since the reaction between Ag+ and CN- is in a 1:1 ratio, all the Ag+ will react until one of the reactants runs out. In this case, it's Ag+ since it's present in a smaller amount. Therefore, practically, no Ag+ remains after the reaction.

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Any entrée can be labeled "healthy" on a menu as long as it contains natural ingredients. True False

Answers

Answer:

False.

Explanation:

Entrée is a culinary term used for a course during a meal service. In parts of the US and Canada, the word entrée is often used to refer to the main dish that is served while in other parts of the world, it usually means the starter or the simple meal that is served before the main dish / course. Entrées can be made of any component but the content of the natural ingredients does not define its healthy status. Thus, it is false to say that any entrée can be labelled "healthy" on a menu as long as it contains natural ingredients.

explain the difference between a neutral atom an isotope and an ion. use a specific element and explain the three possible forms of the element

Answers

Atoms are made of three types of sub atomic particles, they are the electrons, neutrons and protons. 
Electrons are negatively charged and they are orbiting around the nucleus in energy shells. Protons are positively charged , neutrons are neutral and have no charge, both neutrons and protons are located in the nucleus.
In atoms the atomic number is the number of protons the atom consists of and mass number is the sum of protons and neutrons in the nucleus.

In a neutral atom, the number of electrons and protons are equal, this means that the number of negative charges and positive charges are equal.
lets take Cl as an example. Its atomic number is 17.
number of protons and charge - +17
number of electrons with charge - -17
overall chage sum of the charges = + 17 -17 = 0
therefore no charge, hence its neutral.

isotopes are the same element having the same atomic number but different mass numbers.
³⁵Cl -protons - 17 electrons - 17 neutrons 18 neutrons
³⁷Cl - protons - 17 electrons - 17 neutrons 20 neutrons
Both are same element with same number of protons and electrons, however the number of neutrons are different.
Since protons + neutrons = mass of the atom
and when the number of neutrons change - mass of atoms too change
hence, ³⁵Cl has a mass of 35 and ³⁷Cl  has a mass of 37. both of these are called isotopes

Ions are atoms which have either gained an electron or lost an electron and are charged.
metals such as K(atomic number - 19) have one valence electron in the outer shell, to gain the configuration of a complete octet, K needs to give out this one electron.
then number of electrons 19-1 = -18
number of protons                    = +19
overall charge                           = +1
K is one electron less therefore becomes positively charged and called a cation- K⁺
if we take Cl, atomic number - 17
Cl has 7 valence electrons, to gain a complete octet in the outer shell it needs to have  8 electrons, therefore it needs one more electron to complete the outer shell.
Therefore it gains one electron,
number of electrons  17+1  = -18
number of protons               = 17
overall charge                      = -1
with an extra electron, Cl becomes negatively charged, a negative ion called anion - Cl⁻

how does a ketone react with PCl5?,

Answers

When ketone is reacted with phosphorous pentachloride, chlorination takes place at the carbonyl carbon with substitution of the oxygen atom to give a geminal dichloride (with 2 Cl atoms on same carbon) according to the following equation: 

so we can say that acetone is converted into 2,2-dichloropropane by action of PCl₅

Which of the answer choices lists a true statement about ionic compounds?
1. They are formed by atoms that have the same number of valence electrons.
2. They are formed by ions that have the same charge.
3. They are formed by ions that have the opposite charges.
4. They are formed by atoms that have the same number of protons.

Answers

the answer is number 1

Answer:

3. They are formed by ions that have the opposite charges.

Explanation:

Ionic compounds are formed when two oppositely charged ions react. Ionic bonds are formed when an atom has tendency to loose its valence electron/electrons and another atom has tendency to accept them. All the atoms on this earth want to be stable but they can be stable only when they have stable electronic configuration. Some atoms like noble gases have stable electronic configuration already so they don't need to react with any other atom of any other element but others do not have stable electronic configuration and in order to achieve this stable electronic configuration they need to react with atoms of other elements through various kind of bonds/interactions like ionic bond.

An example of ionic bond is interaction between magnesium ion (Mg2+) and chloride (Cl-) to form magnesium chloride (MgCl2).

Apart from ionic bonds there are other type of interactions too like covalent bonds, hydrogen bonds, hydrophobic interactions etc.

What is the concentration of alcohol, in terms of molarity, in blood if the bac is 0.08?

Answers

The molarity of the given solution is  [tex]\boxed{{\text{0}}{\text{.0174 mol/L}}}[/tex].

Further explanation:

Blood alcohol concentration:

The term BAC is also known as blood alcohol concentration. Blood alcohol concentration is a measure of the concentration of alcohol in blood. The BAC is expressed in terms of grams of alcohol present in 100 mL of blood. For example, if BAC is 0.12 % that means 0.12 g of alcohol present in 100 mL of blood.

Molarity:

The molarity of the solution can be defined as the concentration of the solution and is equal to the number of moles of the solute dissolved in 1 liter of the solution.

The expression of molarity (M), volume (V), and number of moles (n) is as follows:

[tex]{\text{M}}=\dfrac{{{\text{n}}\left({{\text{mol}}} \right)}}{{{\text{V}}\left({\text{L}}\right)}}[/tex]           ...... (1)

Here, V is a volume of solution in liters and n is a number of moles of solute.

The given BAC is 0.08 that means 0.08 g of alcohol is present in 100 mL of blood.

The molar mass of alcohol (ethanol) is 46.068 g/mol. Therefore, the number of moles of alcohol present in 0.08 g of alcohol is,

[tex]\begin{aligned}{\text{Mole}}&=\frac{{{\text{given mass}}\left( {\text{g}}\right)}}{{{\text{molar mass}}\left({{\text{mol/g}}}\right)}}\\&=\frac{{0.08{\text{ g}}}}{{46.068{\text{g/mol}}}}\\&=0.0017366{\text{ mol}}\\\end{aligned}[/tex]

The molarity of the alcohol solution in blood can be calculated by dividing the number of moles (0.0017366 mol) with the volume of solution (100 mL or 0.1 L).

[tex]\begin{aligned}{\text{M}}&=\frac{{{\text{n}}\left( {{\text{mol}}}\right)}}{{{\text{V}}\left( {\text{L}} \right)}}\\&=\frac{{0.0017366{\text{ mol}}}}{{0.1{\text{ L}}}}\\&= 0.017366{\text{ mol/L}}\\\end{aligned}[/tex]

Therefore the molarity of solution is [tex]{\mathbf{0}}{\mathbf{.0174 mol/L}}[/tex] .

Learn more:

1. Salts produced from neutralization reaction: https://brainly.com/question/10528663

2. Complete equation for the dissociation of [tex]{\text{N}}{{\text{a}}_2}{\text{C}}{{\text{O}}_3}\left({aq} \right)[/tex] : https://brainly.com/question/5425813

Answer details:

Grade: Senior School

Subject: Chemistry

Chapter: Solutions

Keywords: Concentration of alcohol, BAC, blood alcohol concentration, molarity, number of moles, 0.08 bac, 0.0174 mol/L.

We have that the concentration of alcohol, in terms of molarity is

M=0.017366mol/L

Molarity

Question Parameters:

in blood if the bac is 0.08

Generally the equation for the mol  is mathematically given as

[tex]Mole=\frac{given mass}{molar mass}[/tex]

Therefore

[tex]Mole=\frac{0.08}{46.06}[/tex]

Mole=0.0017366mol

The molarity of the alcohol solution in blood

M=n/V

M=0.0017366mol/0.1

M=0.017366

For more information on Concentration

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If you start with 10.0 grams of lithium hydroxide how many grams of lithium bromide will be produced

Answers

If you mean LiOH+HBr->LiBr+H2O
the answer is 0.4347mol LiBr and that equals (10/23)/80 gram LiBr

Why did the candles stop burning when the students placed glass jars over them?

Answers

Candles burn because it gets enough oxygen from open space.  When the jar is closed it didn't get oxygen to burn. Thus, the candle  will distinguish.

What is oxygen?

Oxygen is 8th element in periodic table. It is the most abundant element in  earth crests. Oxygen is precious because, it is used to respire by all livings things.

Biospheres is interconnected with the atmosphere.  The changes in atmosphere  affects the biosphere. Thus, the composition of gases will definitely affects the living in biosphere.

The gas which burn in atmosphere is hydrogen. But the gas which helps to burn is oxygen.  Substances get oxidised  when reacting with oxygen. Thus combustion of matter is aided by oxygen.

Open air oxidation aids substance to burn. Thus, the burning of candles is aided with the circulation oxygen gases. Hence, when the jar closes the air circulation gets off and it will stop burning.

To know more about oxygen, refer the link below:

https://brainly.com/question/2272415

#SPJ5

Answer:

Oxygen is needed to maintain this type of combustion reaction. The jars prevent oxygen in the surrounding air from reaching the flames, so the flames go out.

Explanation:

This is the correct answer

The maximum concentration set by the U.S. Environmental Protection Agency for lead in drinking water is 15 ppb.
-What is this concentration in milligrams per liter?
-How many liters of water contaminated at this maximum level must you drink to consume 1.0 μg of lead?
Can someone just guide me through the steps for this!!! Thanks(:,

Answers

Final answer:

The EPA's maximum concentration of lead in drinking water is 15 ppb, which is equivalent to 0.015 mg/L. To consume 1.0 µg of lead at this concentration, one would need to drink about 0.067 liters of water.

Explanation:

The maximum concentration for lead in drinking water, as set by the U.S. Environmental Protection Agency (EPA), is 15 parts per billion (ppb). To convert this concentration to milligrams per liter (mg/L), we use the relationship that 1 ppb is equivalent to 1 microgram per liter (1 ppb = 1 µg/L). Since 1 milligram (mg) is equal to 1,000 micrograms (µg), the maximum concentration of lead in drinking water is 0.015 mg/L (15 µg/L).

To find out how many liters of water one must drink to consume 1.0 microgram (µg) of lead at this maximum level, we set up a proportion using the maximum concentration: If 15 µg is in 1 liter of water, then 1 µg would be in 1/15 liters of water. Thus, one would need to drink 1/15 liters, or approximately 0.067 liters, of water to consume 1.0 µg of lead.

A 0.225 kg sample of tin initially at 97.5°c is dropped into 0.115 kg of water. the initial temperature of the water is 10.0°c. if the specific heat capacity of tin is 230 j/kg • °c, what is the final equilibrium temperature of the tin-water mixture

Answers

We can take the final temperature to be t
Energy gained by water is given by mcθ , where m is the mass of water, c is the specific heat capacity of water (4186) and θ is change in temperature. 
Energy given by tin sample is equal to the energy gained by water, therefore:
0.115 ×4186 × (t-10) = 0.225 × 230 × (97.5-t)
9.302(t-10) = 97.5 -t
t = (97.5 + 93.02)/10.302 
t = 18.493 degrees Celsius
Therefore, the final temperature is 18.493° C
Final answer:

To find the final equilibrium temperature of the water-tin mixture, we use the principle of heat transfer. Equating the heat lost by the tin to the heat gained by the water and solving for the final temperature allows us to find the value.

Explanation:

Given the mass, initial temperature and specific heat capacity of the tin and initial temperature of the water, we can calculate the final equilibrium temperature of the water-tin mixture using the principle of heat transfer: when two bodies of different temperatures come into contact, heat transfers from the hotter body to the cooler body until they reach thermal equilibrium, i.e., they have the same temperature.

Assuming no heat loss to the surroundings, the heat lost by the tin equals the heat gained by the water (as the tin cools down and the water heats up). The formula for heat transfer is Q=mcΔT, where Q is the heat energy, m is the mass, c is the specific heat capacity and ΔT is the temperature change.

So, for the tin: Qtin = mtinctin(Tinitial,tin-Tfinal) and for the water: Qwater = mwatercwater(Tfinal-Tinitial,water). Since Qtin = Qwater, equating these two yields, mtinctin(Tinitial,tin-Tfinal) = mwatercwater(Tfinal-Tinitial,water).

This equation allows us to solve for Tfinal, the final equilibrium temperature of the tin-water mixture.

Learn more about Heat Transfer here:

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