7. HgO → Hg + O2
moles of oxygen?
0.5 moles of HgO decompose to produce how many moles of oxygen​

Answers

Answer 1

Answer:

0.5 moles of HgO will produced 0.25 moles of oxygen

Explanation:

Given data:

Number of moles of HgO = 0.5 mol

Number of moles of oxygen = ?

Solution:

Chemical equation;

2HgO   →  2Hg + O₂

WE will compare the moles of HgO with oxygen from balance chemical equation.

                                HgO        :         O₂

                                   2           :          1

                                    0.5       :          1/2×0.5 =0.25 mol

So 0.5 moles of HgO will produced 0.25 moles of oxygen.


Related Questions

against the wind a small plane flew 245 miles in 1 hour and 10 minutes. The return trip took only 50 minutes. What was the speed of the wind? What was the speed of the plane in still air?​

Answers

Answer:

speed of plane in still air  =  252 mph

speed of wind  = 42 mph.

Explanation:

Given:

Distance travelled by the small plane = 245  

Time taken to fly 245 miles =  1 hour and 10 minutes.

Time taken for return trip = 50 minutes.

To Find:

speed of the wind=?

The speed of the plane in still air=?​

Solution:

We Know that

[tex]speed = \frac{distance}{time}[/tex]  

=>[tex]\frac{245}{ \frac{70}{60}} hours[/tex]

=>[tex]\frac{245}{ \frac{7}{6}} hours[/tex]

=>[tex]245 \times { \frac{6}{7}[/tex]

=>210  mph against wind

on way back

=>[tex]\frac{245}{ \frac{50}{60}} hours[/tex]

=>[tex]\frac{245}{ \frac{5}{6}} hours[/tex]

=>[tex]245 \times { \frac{6}{5}[/tex]

=> 294

Now

294 = plane +wind------------------------(1)

210 =plane - wind-------------------------(2)

Solving (1) and (2)

2 plane = 504

plane = 252

plane = [tex]\frac{504}{2}[/tex]

So  substituting plane value in eq(2) we get,

210 =252 - wind

wind = 42 mph

Final answer:

The speed of the wind is 35.6 miles per hour in the opposite direction of the plane's movement, and the speed of the plane in still air is 209.4 miles per hour.

Explanation:

To solve this problem, we can use the formula:

Plane speed in still air = (total distance) / (total time)

Given that the plane flew 245 miles in 1 hour and 10 minutes against the wind, and the return trip took 50 minutes, we can calculate the speed of the wind and the speed of the plane in still air as follows:

Step 1: Convert the time to hours:
1 hour and 10 minutes = 1.17 hours
50 minutes = 0.83 hours

Step 2: Calculate the speed of the plane in still air using the formula:
Speed of the plane in still air = (total distance) / (total time)
Speed of the plane in still air = 245 / 1.17 = 209.4 miles per hour

Step 3: Calculate the speed of the wind by finding the difference between the speed of the plane in still air and the actual speed of the plane against the wind:
Speed of the wind = Speed of the plane in still air - Speed of the plane against the wind
Speed of the wind = 209.4 - 245 = -35.6 miles per hour

Therefore, the speed of the wind is 35.6 miles per hour in the opposite direction of the plane's movement, and the speed of the plane in still air is 209.4 miles per hour.

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Which are examples of physical weathering? Check all that apply.
grinding away of rock surface
top layers flaking off due to release of pressure
water dissolving soft rock
rust forming due to oxidation
temperature changes from hot to cold
animals digging burrows to make homes
water freezing, expanding and thawing repeatedly
acid rain weathering a statue
tree roots growing in the cracks of rock

Answers

Final answer:

Physical weathering refers to the process of breaking down rocks without changing their chemical composition. Examples include grinding away of rock, flaking due to pressure release, and water freezing and thawing.

Explanation:

Physical weathering refers to the process of breaking down rocks into smaller pieces without changing their chemical composition. Examples of physical weathering include the grinding away of a rock surface, the top layers of rock flaking off due to the release of pressure, and the freezing and thawing of water, which causes it to expand and contract and break the rock apart.

Other examples include tree roots growing in the cracks of rocks and animals digging burrows. On the other hand, rust forming due to oxidation and acid rain weathering a statue are examples of chemical weathering.

Final answer:

Physical weathering includes processes like abrasion, exfoliation, temperature fluctuations, freeze-thaw cycles, animal activities, and root wedging, all of which disintegrate rock mechanically.

Explanation:

The examples of physical weathering are those processes that result in the breakdown of rock without altering its chemical composition. Here are the examples that correctly apply to the concepts of physical weathering:

Grinding away of rock surface due to abrasionTop layers flaking off due to release of pressure (exfoliation)Temperature changes from hot to cold causing expansion and contractionWater freezing, expanding, and thawing repeatedly in cracks (freeze-thaw weathering)Animals digging burrows to make homes (biomechanical weathering)Tree roots growing in the cracks of rock (root wedging)

On the other hand, the following are not examples of physical weathering because they involve chemical changes to the rock: water dissolving soft rock, rust forming due to oxidation, and acid rain weathering a statue.

How many ml of apple juice does the company need to make to fulfill an order for 2.5 pellets

Answers

Answer:

250000000000 ml of apple juice

what is molar mass of a gas if 0.0494g of the gas occupies a vol of 0.153 L at temperature of 26C and a pressure of 0.998 atm?

Answers

Answer:

[tex]\large \boxed{\text{7.94 g/mol}}[/tex]

Explanation:

We can use the Ideal Gas Law to solve this problem

pV = nRT

Data:

p = 0.998 atm

V = 0.153 L

T = 26 °C

m = 0.0494 g

1.  Convert temperature to kelvins

T = (26 + 273.15) K =  299.15 K

2. Calculate the number of moles

[tex]\text{0.998 atm} \times\text{0.153 L} = n \times \text{0.082 06 L}\cdot\text{atm}\cdot\text{K}^{-1}\text{mol}^{-1}\times \text{299.15 K}\\\\0.1527 = n \times \text{24.55 mol}^{-1}\\\\n = \dfrac{0.1527}{\text{24.55 mol}^{-1}} = 6.220 \times 10^{-3} \text{ mol}[/tex]

3. Calculate the molar mass

[tex]\text{Molar mass} = \dfrac{\text{mass}}{\text{moles}}\\\\M = \dfrac{m}{n}\\\\M = \dfrac{\text{0.0494 g}}{6.220 \times 10^{-3} \text{ mol}}\\\\M = \textbf{7.94 g/mol}\\\text{The molar mass of the gas is } \large \boxed{\textbf{7.94 g/mol}}[/tex]

Cathode rays are composed of_____.

a. protons

b. electrons

c. neutrons

Answers

Answer:

negatively-charged particles.(ELECTRON) B

Explanation:

Electrons are the negatively charged particles of atom. Together, all of the electrons of an atom create a negative charge that balances the positive charge of the protons in the atomic nucleus

It’s electron B because it’s electric charged

Oxalic acid reacts with sodium hydroxide according to the following equation:
H2C2O4 + 2 NaOH → Na2C20. + 2 H20
A 25.00 mL sample of the H2C2O solution required 19.62 mL of 0.341 M NaOH for
neutralization. Calculate the molarity of the acid.​

Answers

Answer:

Concentration = 0.14 M

Explanation:

Given data:

Volume of base = 19.62 mL

Molarity of base = 0.341 M

Volume of acid = 25.00 mL

Molarity of acids = ?

Solution:

Number of moles of base = Molarity × volume in litter

Number of moles = 0.341 mol/L × 0.02 L

Number of moles =  0.007 mol

Concentration of acid:

Concentration = 1/2 (0.007 mol) / 25 mL × 10⁻³ L/mL

Concentration = 0.0035 mol / 25 × 10⁻³ L

Concentration = 1.4  × 10⁻¹ M

Concentration = 0.14 M

Explain why ionic compounds are electrically neutral

Answers

Answer:

Ionic compounds are electrically neutral because the positive ions and the negative ions in the compound cancel each other.

Explanation:

Ion- It is an atom or a molecule that has an equal number of protons (subatomic particles with positive electric charge) and electrons (subatomic particles with negative electric charge).

Positive ion- This is also called a "cation." It consists of more protons than electrons.

Negative ion- This is also called an "anion." It consists of more electrons than protons.

Ionic compounds are electrically neutral because they consist of anions and cations. This neutralizes the compounds. A common example of ionic compound is the NaCl (Sodium Chloride). The Na (Sodium) atom loses an electron in order to become Na+ while the Cl (Chlorine) atom gains an electron in order to become Cl-. This interaction balances them together.  

Final answer:

Ionic compounds are electrically neutral overall because the total number of positive charges of the cations equals the total number of negative charges of the anions. This allows ionic compounds to maintain overall neutrality despite the presence of positive and negative ions.

Explanation:

In every ionic compound, the total number of positive charges of the cations equals the total number of negative charges of the anions. Thus, ionic compounds are electrically neutral overall, even though they contain positive and negative ions. We can use this observation to help us write the formula of an ionic compound. The formula of an ionic compound must have a ratio of ions such that the numbers of positive and negative charges are equal.

For an experiment, you need to dissolve 0.14 mole of NaCl in 1 liter of water. How much NaCl must you weighout?

0.14 g
3.2 g
5.9 g
8.2 g

Answers

Answer:

option D is correct that is  8.2 g

Explanation:

Data Given:

mole of NaCl = 0.14 mol

Volume of water = 1 L

Weight of Nacl = ?

Solution:

In this we know the amount of NaCl and to find weight of NaCl to form a solution.

So,

Formula Used

    no. of moles = weight in g / Molar mass . . . . . . . . . . (1)

Molar mass of NaCl = 23 + 35.5

Molar mass of NaCl = 58.5 g/mol

     

Rearrange equation (1)

        no. of moles = weight in g / Molar mass . . . . . . . . . . (1)

        weight of Nacl =  no. of moles x Molar mass . . . . . . . . . . (2)

Put values in the Equation 2

             weight of Nacl = 0.14 mol x 58.5 g/mol

              weight of Nacl = 8.2 g

weight of Nacl = 8.2 g

So option D is correct that is  8.2 g

lewis dot structure for SeO

Answers

Answer:

selenium dioxide

Explanation:

Final answer:

The Lewis dot structure for SeO shows a double bond between Selenium (Se) and oxygen (O), with each atom sharing two of its six valence electrons to form the double bond and retaining the remaining as non-bonding pairs.

Explanation:

The Lewis dot structure for SeO (Selenium monoxide) consists of selenium represented by the symbol 'Se', surrounded by six valence electrons drawn as dots, and oxygen represented by 'O', surrounded by six valence electrons. Selenium and oxygen form a double bond which is illustrated by sharing four of their electrons (two pairs), while the remaining electrons are the non-bonding pairs.

The structure can be drawn as follows: Se = O :

In this diagram, ':' represents the non-bonding pairs of valence electrons while '=' represents the electron pairs making up the double bond between selenium and oxygen.

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1. What is the maximum amount of NaCl that can dissolve in
200 g of water? (The solubility of NaCl is 35 g/100 g H20 at
20°C.) *

Answers

Answer:

70g

Explanation:

Rate = 35g of NaCl can dissolve in 100g of H2O

Use proportions for 200g of H2O:

[tex]\frac{35}{100} = \frac{x}{200}[/tex]

Since 200 is double of 100, x needs to be double of 35.

[tex]\frac{35}{100} = \frac{70}{200}[/tex]

Therefore the maximum amount of NaCl that can dissolve in 200g of water is 70g.

how many moles are in 75.02 grams of strontium​

Answers

Answer:

1 grams Strontium Fluoride to mol = 0.00796 mol

10 grams Strontium Fluoride to mol = 0.07961 mol

50 grams Strontium Fluoride to mol = 0.39804 mol

100 grams Strontium Fluoride to mol = 0.79607 mol

200 grams Strontium Fluoride to mol = 1.59214 mol

500 grams Strontium Fluoride to mol = 3.98036 mol

1000 grams Strontium Fluoride to mol = 7.96072 mol

- Hopefully this helps a bit :)

Group 7 elements on the periodic table tend to form ions with a -1 charge. Explain why this is true.

Answers

Answer: They ionize by the gain of one electron

Explanation:

Group 7 elements have seven electrons on their outermost shell, in order to have a complete octet structure, the go into bonding with other elements by gaining one more electron to have eight complete outermost shell electron (valence electron). They thereby ionize by gain one electron forming X[tex]X^{-1}[/tex]



Stoichiometry Practice 2

For each of the problems below:

a. Write the balanced chemical equation.

b. Identify the given (with units) and what you want to find (with units).

c. Show set up with units. Check work, give final answer with units and label.

1. Using the Hoffman apparatus for electrolysis, a chemist decomposes 36 g of water

into its gaseous elements. How many grams of hydrogen gas should she get

(theoretical yield)?

Bal. Equation:

ven: 3log of water

ant;




HELPPP ME NOWW

Answers

Answer:

a = The chemical equation written by balancing the total number of atoms of each element in reactants and products is called balanced chemical equation.

can someone please please explain how to write the formula for a compound containing a polyatomic ion. If you could include examples that would be great too!

Answers

Answer:

Explanation:

Polyatomic ions are ions which consist of more than one atom. For example, nitrate ion, NO3-, contains one nitrogen atom and three oxygen atoms. The atoms in a polyatomic ion are usually covalently bonded to one another, and therefore stay together as a single, charged unit.

Final answer:

To write the formula for a compound with a polyatomic ion, consider that the compound should be electrically neutral. Balance the charges from different ions, treating polyatomic ions as discrete units. For instance, calcium phosphate (Ca3(PO4)2) illustrates this with three calcium ions and two phosphate ions.

Explanation:

When writing the formula for a compound containing a polyatomic ion, you must consider that the compound has to be electrically neutral overall. This often involves balancing the number of positive and negative charges coming from different ions. The polyatomic ions are usually treated as discrete units in the formula.

For example, consider calcium phosphate, which has the formula Ca3(PO4)2. Here, there are three calcium ions (Ca²+), and two phosphate groups (PO4³-). Each PO4³- group comprises one phosphorus atom and four oxygen atoms. The overall compound is electrically neutral because the positive charges from the three calcium ions balance out the negative charges from the two phosphate ions.

Another example can be seen in the ionic compound sodium oxalate, which has the formula Na₂C₂O₄. Here, the polyatomic ion is C₂O₄²-, and the compound has two sodium ions (Na⁺) for each oxalate ion. The formula of this compound is not empirical because it represents the number of atoms in the discrete unit of the oxalate ion.

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Using only the information available in the periodic table, consider the elements sulfur and oxygen. From their location on the periodic table, identify the oxidation state and number of valence electrons for sulfur and oxygen. Then use this information to describe their reactivity.

Which statement most accurately describes the compound formed by sulfur and oxygen?


A) Sulfur dioxide, SO2, is ionic, formed between sulfur and oxygen ions.

B) Sulfurous oxide, SO2, is ionic, formed by the ionic bonding of sulfur and oxygen.

C) Sulfur monoxide, SO, is covalent, formed by the sharing of electrons between sulphur and oxygen.

D) Sulfur dioxide, SO2, is covalent, formed by the sharing of electrons

Answers

Answer:

Option D

Explanation:

In Sulphur dioxide molecule both sulphur and oxygen have 6 valence electrons

The oxidation state of Sulphur in Sulphur dioxide molecule is +4 and the oxidation state of oxygen in Sulphur dioxide molecule is -2

Both sulphur and oxygen in this molecule are non-metals and therefore there will be no ionic bond present between them

So bond formation in this molecule takes through sharing of electrons between sulphur and oxygen and due to the sharing of electrons, covalent bond formation takes place between them

As there are only covalent bonds involved, this molecule is a covalent molecule

∴ Sulphur dioxide molecule is covalent and formed by the sharing of electrons

Final answer:

Sulfur and oxygen, both in group 16, have six valence electrons. Sulfur dioxide (SO2) is formed by the sharing of electrons, creating a covalent bond with a sulfur oxidation state of 4+.

Explanation:

From their location on the periodic table, both sulfur and oxygen are in group 16 and have six valence electrons. The typical oxidation state for oxygen is 2-, and sulfur can also have an oxidation state of 2-. However, sulfur is known to exhibit a range of oxidation states, including positive ones in certain compounds.

Regarding reactivity, oxygen is highly reactive and forms oxides with most elements. Sulfur also reacts with many elements, including metals, forming sulfides, and multiple oxidation states when reacting with nonmetals. The reaction between sulfur and oxygen results in the formation of sulfur dioxide, SO2, which is a compound where sulfur has a 4+ oxidation state.

The correct statement that most accurately describes the compound formed by sulfur and oxygen is D) Sulfur dioxide, SO2, is covalent, formed by the sharing of electrons.

(100 points+Brainlyest If Correct)
Which of these could be their own ecosystem? Please select ALL that apply.

An aquarium


The soil in a backyard


Lake Erie


A dead tree

Answers

Answer:

a b d

these are part of an ecosystem or can be

u are given a 30.0g sample of radioactive uranium that has a half-life of 12 hours. How much uranium will be left after 2 days? 1Choice 1 3.75g 2Choice 2 15.0g 3Choice 3 60.0g 4Choice 4 1.88g

Answers

Answer:

1.88 g

Explanation:

We are given;

Mass of a radioactive sample of Uranium as 30.0 g Half life of Uranium sample is 12 hoursTime is 2 days

We are required to determine the amount of uranium left after 2 days

We are going to use the formula;

N = N₀ × 0.5^n

Where, N is the remaining mass, N₀ is the original mass and n is the number of half lives.

n = (2 × 24) ÷ 12 hours

  = 4

Therefore;

Remaining mass, N = 30.0 g × 0.5^4

                                = 1.875 g

                                = 1.88 g

Therefore, the mass of the remaining sample after decay is 1.88 g

Bob mixed 5 mg of sodium hydroxide pellets in 100 mL of water. Describe how the rate of the solution changes when he adds 1 mg more of sodium hydroxide pellets.

Answers

Answer:

As Bob add more solute to dissolves, the rate of solution will be decreases

Explanation:

At certain temperature the maximum amount of solute dissolve in the specific amount of solution or solvent.

There are many factors that affect solubility of the solute in solvent. Nature of the solute also affects the rate of solubility.

Temperature also affects the rate of solubility. Solubility increase when the temperature increases.

Pressure: Change in pressure have no effect on the rate of solubility

The rate of solution:  is a measure that how fast a substance dissolves in solvent.

Amount of solute already dissolved affect the rate of solution. If a solvent have little amount of solute in the solution it dissolve quickly. But when you have more solute in the solution the process was slower.

1 g of lead dissolves in 100 g of water at room temperature.  Similarly 5 mg of sodium hydroxide pellet dissolve in 100ml of water at room temperature.

So if Bob add 1 mg more of NaOH in the same 100ml of water the rate of the solubility decreases.

As there are some factors that decrease the solubility rate of NaOH pellet as follow:

• large size of the solute dissolve slowly as the solubility process take on      the surface of the solute particles, powders dissolve fast.

• less amount of solvent with ratio to solute

• saturated solution

So due to all above reasons the rate of the solubility decreases upon adding a little more amount of NaOH pellet.

Answer:

a

Explanation:

:)

calculate moles of 3.9g of sodium

Answers

Answer:

[tex]\boxed{\text{0.17 mol}}[/tex]

Explanation:

[tex]\text{M$_{r}$ of Na} = 22.99\\\text{Moles} = \text{3.9 g } \times \dfrac{\text{1 mol}}{\text{22.99 g}} = \text{0.17 mol}\\\\\text{ The sample contains $\boxed{\textbf{0.17 mol}}$ of Na}[/tex]

Find both the volume percent of a solution that has 10.0 g of ethanol (D = 0.7893 g/mL) and 90.0 g of water (D = 0.9987 g/mL). Assume volumes are additive.

Answers

Answer:

Volume percent of a solution that has 10.0 g of ethanol= 12.37%

Volume percent of a solution that has 90.0 g of water = 87.69%

Explanation:

Volume Percent:

The volume percent helps us  to indicate the concentration of the solution when the volume of the solute and volume of the solution is given by

[tex]Volume Percent=\frac{\text{Volume of the Solute}}{\text{Volume of Solution}}\times100%[/tex]

With respect to density 1mL of ethanol

=> 0.7893g or 10g of methanol contains

=> [tex]\frac{1}{0.7893}\times10[/tex]

=> 12.67mL

And for water = [tex]\frac{1}{0.9987} \times 90.0[/tex]

=> 90.12mL

Now total volume = 90.12+ 12.67 = 102.79mL

%(v/v) for water = [tex]\frac{90.12}{102.79}\times 100[/tex]

 = 87.69%

%(v/v) for ethanol = [tex]\frac{12.67}{102.79}\times 100[/tex]

 = 12.37%

Final answer:

The volume percent of ethanol in the solution is 12.3%, and the volume percent of water is 87.7%. This is calculated by determining the volume of each substance using their respective densities and the mass provided and then finding the percentage of each substance's volume in the total solution volume.

Explanation:

To find the volume percent of a solution that has 10.0 g of ethanol with a density (D) of 0.7893 g/mL, and 90.0 g of water with a density (D) of 0.9987 g/mL, we first calculate the volumes of each component. For ethanol, divide 10.0 g by 0.7893 g/mL to get the volume in milliliters. For water, divide 90.0 g by 0.9987 g/mL to get the volume in milliliters.

To calculate the volume of ethanol: 10.0 g / 0.7893 g/mL = 12.7 mL
To calculate the volume of water: 90.0 g / 0.9987 g/mL = 90.2 mL
Assuming volumes are additive: Total volume of the solution = 12.7 mL (ethanol) + 90.2 mL (water) = 102.9 mL

Now, we can find the volume percent of ethanol: (volume of ethanol / total volume of solution) × 100% = (12.7 mL / 102.9 mL) × 100% = 12.3%

The volume percent of water is similarly calculated: (volume of water / total volume of solution) × 100% = (90.2 mL / 102.9 mL) × 100% = 87.7%

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Question 10 OT 20
10. In an oxidation reaction the oxidizing agent:
A. Is oxidized
B. Is reduced
c. Takes oxygen from the target substance
D. Adds hydrogen to the target substance

Answers

Answer:

B) is reduced.

Explanation:

Oxidation:

Oxidation involve the removal of electrons and oxidation state of atom of an element is increased.

Reduction:

Reduction involve the gain of electron and oxidation number is decreased.

Consider the following reactions.

4KI + 2CuCl₂  →   2CuI  + I₂  + 4KCl

the oxidation state of copper is changed from +2 to +1 so copper get reduced and it is oxidizing agent.

CO + H₂O   →  CO₂ + H₂

the oxidation state of carbon is +2 on reactant  side and on product side it becomes  +4 so carbon get oxidized and it is reducing gent.

Oxidizing agents:

Oxidizing agents oxidize the other elements and itself gets reduced.

Reducing agents:

Reducing agents reduced the other element are it self gets oxidized.

39. Chromium and chlorine form an ionic compound whose formula is CrCl3. The name of this
compound is
a. chromium (III) chloride
c. monochromium trichloride
b. chromium chlorine
d. chromium(III)trichloride

Answers

Answer:

a. chromium (III) chloride

Explanation:

Chromium chloride is also binary ionic compound composed of only two element chromium and chlorine.

When naming these compounds the name of metal or cation is written first and anion is written after the cation. The anions are non meals.

The anion name is end with suffix " ide".

such as chromium chloride.

The (III) shows the oxidation number of metal. In given compound the oxidation state of chromium is +3 while chlorine chow the oxidation state of -1 that's why three chlorine atoms are attached with one chromium atom.

Final answer:

The ionic compound CrCl3 is correctly named chromium(III) chloride, identifying the trivalent state of chromium in the compound.

Explanation:

The correct name for the ionic compound with the formula CrCl3 is chromium(III) chloride. This name indicates that the chromium ion in the compound has a valency of three, which is communicated by the Roman numeral III. Ionic compounds such as this are named by stating the metal ion followed by the non-metal ion with an -ide ending, and when the metal can form ions with different charges, the specific charge is included in parentheses in Roman numerals immediately after the name of the metal.

Some similar examples include iron(II) chloride (FeCl2) and iron(III) chloride (FeCl3), where the Roman numerals II and III denote the valency of the iron ion in each compound, respectively.

. If 0.357 g of CH4 gas is introduced into an evacuated 1.75 L flask at 25°C, what is the pressure in
.08206 L atm/mol K)​

Answers

Final answer:

To find the pressure of CH4 gas in a flask, one must convert the mass of methane to moles, plug it into the Ideal Gas Law equation (PV = nRT), and solve for pressure. After calculation, the pressure of the methane gas at 25°C in a 1.75 L flask is approximately 0.33 atm.

Explanation:

To calculate the pressure of CH4 gas in a flask using the Ideal Gas Law, you need to use the amount of substance (in moles), the volume of the container, the temperature, and the ideal gas constant in appropriate units. First, convert the mass of CH4 to moles by dividing by the molar mass of methane (16.04 g/mol). Then, use the Ideal Gas Law formula PV = nRT to solve for pressure (P).

Moles of CH4 = 0.357 g / 16.04 g/mol = 0.02226 mol

Given: V = 1.75 L, T = 25°C (which is 298.15 K when converted to Kelvin), R = 0.08206 L atm/mol K

Now, substitute the values into the Ideal Gas Law equation:

P = (nRT) / V

P = (0.02226 mol * 0.08206 L atm/mol K * 298.15 K) / 1.75 L

P = 0.3298 atm

Therefore, the pressure of CH4 gas in the flask at 25°C is approximately 0.33 atm.

The reactants of two chemical equations are listed.

Equation 1: AgNO3 + Zn
Equation 2: AgNO3 + MgCl2

Based on the type of reaction, which reaction can be used to extract silver metal from silver nitrate solution?

Answers

Final answer:

The reaction that can extract silver metal from a silver nitrate solution is Equation 1, where zinc metal reacts with silver nitrate, displacing the silver and allowing it to precipitate.

Explanation:

To extract silver metal from silver nitrate solution, one would look for a chemical reaction where a more reactive metal displaces silver from its compound. In Equation 1, we have AgNO3 reacting with Zn, which is a more reactive metal known to displace other metals in a single displacement reaction. The reaction between zinc and silver nitrate can be represented as follows: Zn(s) + 2AgNO3(aq)
ightarrow Zn(NO3)2(aq) + 2Ag(s). This results in the precipitation of silver metal (Ag). References to similar reactions such as the reaction between copper and silver nitrate, where silver is also displaced and precipitated, support this concept.

On the other hand, Equation 2, which involves MgCl2 reacting with AgNO3, does not lead to a displacement reaction to extract silver because chlorides are usually spectators in such reactions unless conditions like oxidation or other complex reactions are involved. Additionally, MgCl2 itself as a compound does not have a free metal to displace silver from silver nitrate.

Therefore, the reaction that can be used to extract silver metal from a silver nitrate solution is Equation 1, where zinc metal is reacting with silver nitrate.

determine the number of cobalt atoms in a 117.86 g sample of cobalt

Answers

Answer:

12.04 × 10²³ atoms

Explanation:

Given data:

Mass of cobalt = 117.86 g

Number of atoms = ?

Solution:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

For example,

Number of moles of cobalt = 117.86 g/ 58.9 g/mol

Number of moles of cobalt = 2 mol

one moles of cobalt =  6.022 × 10²³ atoms of cobalt

2 moles × 6.022 × 10²³ atoms / 1 mol

12.04 × 10²³ atoms

How many grams of chlorine gas are needed to make 117 grams of sodium chloride? Given the reaction: 2Na + Cl2 → 2NaCl

Answers

Answer:

71 grams of chlorine gas.

Explanation:

2Na + Cl2 = 2NaCl.

From the molar masses:

2(23+35.45) g of NaCl are made from  2*35.45 g Cl2 gas.

So  117 g are made from  (2*35.45  * 117)  / 2(23+35.45)

= 71 g.

Final answer:

To make 117 grams of sodium chloride, you would need 121 grams of chlorine gas.

Explanation:

To calculate the amount of chlorine gas needed to make 117 grams of sodium chloride, we need to use stoichiometry.

Step 1: Convert the mass of sodium chloride to moles using the molar mass of NaCl which is 58.4 g/mol.

Step 2: Use the balanced equation to determine the mole ratio between chlorine gas and sodium chloride. From the equation 2Na + Cl2 -> 2NaCl, we can see that 1 mole of Cl2 reacts with 2 moles of NaCl.

Step 3: Convert moles of Cl2 to grams using the molar mass of Cl2 which is 70.9 g/mol.

Therefore, to make 117 grams of sodium chloride, we need (117 g NaCl) * (1 mol NaCl / 58.4 g NaCl) * (1 mol Cl2 / 2 mol NaCl) * (70.9 g Cl2 / 1 mol Cl2) = 121 grams of chlorine gas.

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How can general properties influence element location on a periodic table?

Answers

Answer:

The elements in the periodic table are arranged in order of increasing atomic number.

Explanation:

The elements are arranged based on their atomic numbers in a periodic table, not based on their atomic masses.  

• The chemical elements in the periodic table are demonstrated in order of their atomic number.  

• In the modern periodic table, the arrangement of elements is done based on their atomic number, not their relative atomic masses.  

• In the periodic table, the horizontal rows, known as periods, show the arrangement of elements in order of increasing atomic number.  

Thus, based on atomic numbers, elements are arranged in a periodic table.

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Looking at a potential energy diagram what is the name given to represent the amount of energy needed for the
reaction to take place?
Released energy
Stored energy
Activation energy
Free energy

Answers

Answer:

activation activation energy is defined as the minimum amount of energy needed to start a reaction.

Answer:

Stored Energy(☞゚ヮ゚)☞☜(゚ヮ゚☜)¯\_(ツ)_/¯

Explanation:

Calculate the amount of CuSO4•5H2O required to make 25 mL of a 0.45 M solution of CuSO4.

Answers

Answer:

Mass = 1.76 g

Explanation:

Given data:

Volume of solution = 25 mL

Molarity = 0.45 M

Amount of CuSO₄.5H₂O = ?

Solution:

Molarity = number of moles / volume in litter

Number of moles = Molarity × Volume in L

Number of moles = 0.45 M  × 0.025 L

Number of moles = 0.011 mol

Mass of f CuSO₄.5H₂O:

Mass = Number of moles ×  molar mass

Mass = 0.011 mol × 159.6 g/mol

Mass = 1.76 g

How many moles are there in 8.50 X 10^24 molecules of sodium sulfate, Na2SO3?

(Molecules to Moles)

A.) 51.2 moles

B.) 5.12x10^48 moles

C.)14.1 moles

D.)1.40 Moles

Answers

Answer:

C) 14.1 moles

Explanation:

1 mole = 6.02 *10^ 23

8.50 * 10^24 molecules *(1 mole/6.02*10^23 molecules) ≈ 14.1 moles

The number of moles there are in 8.50 X [tex]10^{24}[/tex] molecules of sodium sulfate is 14.1 moles (option C).

How to calculate number of moles?

The number of moles in a molecule of a substance can be calculated by dividing the number of molecules by Avogadro's number as follows:

no of moles = no of molecules ÷ 6.02 × [tex]10^{23}[/tex] molecules

According to this question, there are in 8.50 X [tex]10^{24}[/tex] molecules of sodium sulfate in a substance. The number of moles in this substance can be calculated as follows:

no of moles = 8.50 X [tex]10^{24}[/tex] ÷ 6.02 × [tex]10^{23}[/tex]

no of moles = 14.1 moles

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