The half-life of tritium, or hydrogen-3, is 12.32 years. After about 37 years, how much of a sample of tritium will remain unchanged?

A)1/8   B)1/4  C)1/3  D)1/2

Answers

Answer 1
I think that the answer is 1/8 Hope this helps!!!! :D
Answer 2

The correct option is A) 1/8


half-life of tritium, or hydrogen-3, is 12.32 years.      

After about 37 years,

= 37/12.32

= 3

means 3 half lives.


sample of tritium that will remain unchanged will be:

= 1/2^no.of half lives

= 1/2³

= 1/2 x 1/2 x 1/2 = 1/8

1/8 remains back






Related Questions

Calculate either [H3O ] or [OH–] for the solutions below at 25 C.
[OH-]=1.83x10^-7 M
[H3O+]=? M

Answers

Answer is: concentration of hydronium ions is 5,5·10⁻⁸ M.
[OH⁻] = 1,83·10⁻⁷ M; equilibrium concentration.
The Kw (the ionic product for water) at 25°C is 1·10⁻¹⁴ mol²/dm⁶ or 1·10⁻¹⁴ M².
Kw = [H₃O⁺] · [OH⁻].
[H₃O⁺] = Kw ÷ [OH⁻].
[H₃O⁺] = 1·10⁻¹⁴ M² ÷ 1,83·10⁻⁷ M.
[H₃O⁺] = 5,5·10⁻⁸ M.

This problem requires using the concept of pH and pOH. The “p” stands for the negative log so pH and pOH represent the negative log of the concentration of hydrogen or hydroxide ions.

Here is the solution:

pOH = -log [OH-]

pOH = -log [1.83x10^-7 M]

pOH = 6.74

 

pH + pOH = 14

pH = 14 - 6.74

pH = 7.26

 

pH = -log [H3O+]

7.26 = -log[H3O+]

[H3O+] = 5.46 x 10^-8 M

The leading cause for dementia is Alzheimer's disease.
True
False

Answers

True.

Dementia's main cause is Alzheimer's disease (50%-70% of cases). You can find it in the DSM-5 as Major Neurocognitive Disorder due to Alzheimer's Disease.

A chemical weathering process in which polar water molecules surround individual ions

Answers

Hi!

The chemical weathering process in which polar water molecules surround individual ions is called Solvation.

When ions are dissolved, they get surrounded by solvent molecules (In this case, water molecules) to stabilize the ion with the opposing charge. To achieve solvation, it is necessary for the energy of the solvated ion to be lower than the energy of the crystalline lattice of the solid. As systems tend to the lowest energy, the formation of the solvated ion is favored. This is called the solvation enthalpy

Have a nice day!

C3h8 + 5 o2 --> 3 co2 + 4 h2o this is an example of a _______________.

Answers

Answer:
combustion reaction

Explanation:
In chemistry, a combustion reaction is defined as a reaction between an oxidant and any compound that leads to the production of another compound along with a huge amount of heat.

Now, let's check the reaction given:
C₃H₈ + 5 O₂ --> 3 CO₂ + 4 H₂O
The oxidant is oxygen gas
The compound reacting is propane
The compound produced is carbon dioxide along with water vapor and heat

Therefore, the given reaction is a combustion reaction

Hope this helps :)

Answer: [tex]C_{3}H_{8} + 5O_{2} \rightarrow 3CO_{2} + 4H_{2}O[/tex] this is an example of a combustion reaction.

Explanation:

A reaction in which a compound reacts with oxygen and results in the formation of carbon dioxide and water is known as combustion reaction.

For example, [tex]C_{3}H_{8} + 5O_{2} \rightarrow 3CO_{2} + 4H_{2}O[/tex] is a combustion reaction.

Also, it is known that combustion reactions are exothermic in nature because heat is released during these reactions.

How much water, in grams, can be made from

1.11 × 1024 hydrogen molecules?

Answer in units of g.


Please, I don't understand this at all. I need help :/

Answers

2 moles of hydrogen molecules forms 2 moles of water or 36 g of water. 2 molecule of hydrogen contains 1.2 × 10²⁴. Thus, 1.11× 10²⁴ hydrogen molecules will give 33.3 g of water.

What is one mole?

One mole of any compound contains 6.022 × 10²³ molecules. This number is called Avogadro number. Thus,one mole water contains 6.022 × 10²³  water molecules.

2 moles of hydrogen molecules will give 2 moles of water. One mole of hydrogen molecule contains 6.022 × 10²³ molecules.

molar mass of water = 18 g/mol

2 moles of water = 36 g.

Then, 2 moles of H₂ = 2 × 6.022 × 10²³ =  1.2 × 10²⁴ molecules

These much hydrogen molecules produces 36 g of water. Thus, mass of water produced by 1.11× 10²⁴ hydrogen molecules is :

(1.11× 10²⁴ × 36 )/1.2 × 10²⁴  = 33.3 g.

Therefore, the mass of water produced from 1.11× 10²⁴ hydrogen molecules is 33.3 g.

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2. The electrolyte in automobile lead storage batteries is a 3.75 M sulfuric acid solution that has a density of 1.230 g/mL. Calculate the mass percent, molality, and mol fraction of the sulfuric acid.
i am so lost dont know how to get the kg of solvent,

Answers

Solutions:
1. 
Density of solution = (1.23 g / mL) • (1000 mL/ 1 L)
= 1230 g solution/L solution.

grams of H2SO4 = (3.75 mols H2SO4) • (98.07 g H2SO4 / 1 mol)
= 368 g H2SO4 in 1 L.

mass percentage H2SO4 = 368 g H2SO4 / 1230 g solution) • 100
= 29.9% H2SO4

2. Convert Grams to moles
= 368 g H2SO4 • (1 mol H2SO4/ 98.07 g H2SO4)
 = 3.75 mol H2SO4
difference of total solution- total grams=  1230 g solution - 368 g H2SO4
= 862 g H2O. 
Convert grams to kg,
= 862 g 8 (1 kg / 1000 g)
= 0.862 kg H2O
Thus,
Molality = m
= 3.75 mol H2SO4/ .862 kg H2O
= 4.35.

3. = 862 g water • (1 mole / 18 g water)
= 47.89 mol water
mole fraction of H2SO4 = X
= 3.75 mol H2SO4/ (3.75 moles H2SO4 + 47.89 moles water) 
 = 0.726

Final answer:

To calculate the mass percent, molality, and mole fraction of sulfuric acid in a lead storage battery, you need to perform calculations involving the solution's molarity, density, and the molar mass of H₂SO₄. You must find the mass of the solution, then determine the mass and moles of the solute and solvent.

Explanation:

To calculate the mass percent, molality, and mole fraction of sulfuric acid (H₂SO₄) in an automobile lead storage battery with 3.75 M sulfuric acid and a density of 1.230 g/mL, you need to perform several calculations.

Mass Percent.The mass percent of the solution is the mass of the solute (in this case, H₂SO₄) divided by the total mass of the solution multiplied by 100. Based on the volume of the solution and its molarity, you can find the number of moles of H₂SO₄, which helps to calculate mass, as you know the molar mass of H₂SO₄ is 98.079 g/mol.

Molality. Molality is the number of moles of solute per kilogram of solvent (water in this case). To find the molality, you would calculate the number of moles of sulfuric acid based on its molarity and then calculate the mass of the solvent in kilograms. Remember that the density and the volume of the solution can lead you to find the mass of the solution itself, from which you subtract the mass of the solute to get the mass of the solvent.

Mole Fraction.The mole fraction is the ratio of the number of moles of the solute to the total number of moles of all components in the solution. This requires you to know the moles of both the solute and the solvent.

what is the molar of mass of copper (II) sulfate CuSOu?

Answers

191.546,,,,,,,,,,,,,,,,,,,

wrapping a hot dish of food in shiny aluminium foil seems to keep the dish warm longer than wrapping it in clear plastic film . aluminium is much better conductor of heat than plastics , so why does it impede the flow of heat so well?

Answers

There are three different mechanisms for heat to transfer. Let's take a look at them to see if any of them explain the cause.

   1. Conduction - This is the transfer of heat from one object to another via physical contact. And in the question, aluminium is a far better conductor of heat than plastic, so aluminum would transfer heat faster via conduction than plastic. So the cause for the observed phenomena has to be one of the other 2 mechanisms.

   2. Convection - This mechanism relies upon the fact that for fluids (both gasses and liquids) change their volume and therefore their density with changes in temperature. This means that you can have a fluid get warmed up by something that's hot, expand to decrease it's density and then get pushed away from the warm surface by colder, denser fluid. The warmed fluid then gets cooled off when it contacts a colder surface, it's density increases, and then flows back replacing the newly warmed fluid. For both aluminum and plastic, there is likely to be equivalent convection effects in the air gap between the hot food and the substance being used to cover the food. And once again, since aluminum is a better conductor of heat, it would be more effective in cooling the warmed air, making convection work faster. So this mechanism doesn't work either. So let's look at the 3rd method of transferring heat.

   3. Radiation - This is the process by which heat is radiated out from a warmer body in all directions via photons traveling through either vacuum or a transparent medium. An example would be the heat you feel from an electric stove. In this case, the photons carrying energy will go right through the clear plastic wrap unimpeded, while they would be reflected back to the food with the aluminum foil. So of the 3 mechanisms, the aluminum foil impedes the flow of heat via radiation far better than the clear plastic film. And in fact, it does that so much better than even with the disadvantage the foil has via conduction, it's more than out weighed by the better performance against radiation.

"what is the pressure of a 34.8-l gas sample containing 7.45 mol of gas at 19.9°c? (r = 0.0821 l • atm/(k • mol), 1 atm = 760 torr)"

Answers

You can solve this problem using ideal gas formula (PV=nRT). Remember that the temperature used is Kelvin, so 19.9°c would be: 19.9+ 273.15= 293.05°K

PV=nRT
P= nRT / V
P= 7.45 * 0.0821* 293.05 / 34.8
P= 5.15 atm = 3914.5 torr

Answer:

The gas pressure is 5.15 atm

Explanation:

Given:

Volume of gas, V = 34.8 L

Moles of gas, n = 7.45 moles

Temperature, T = 19.9 C

To determine:

Pressure, P of the gas

Explanation:

Based on the ideal gas equation:

[tex]PV = nRT[/tex]

where P = pressure, V = volume, n = moles, T = temperature, R = gas constant

[tex]P = \frac{nRT}{V} \\\\P = \frac{7.45\ moles*0.0821\ Latm/mol-K*(19.9+273)\ K}{34.8\ L} =5.15\ atm[/tex]

How is electron movement related to the bonding in sodium chloride?

Answers

Cl is highly electronegative and will actually pull away 1 electron from sodium, forming an ionic bond. 

Answer:

Electrons exchange creating ions to form an ionic bond by electrostatic attraction.

Explanation: I just answered this on USA test prep.

At 700 K, CCl4 decomposes to carbon and chlorine. The Kp for the decomposition is 0.76. Find the starting pressure of CCl4 at this temperature that will produce a atotal pressure of 1.9atm at equilibrium.

Answers

Reaction of CCl4 decomposition is following:
 CCl4 (g) --> C (s) + 2Cl2 (g)
 Kp = 0.76 = (P Cl2)^2/(P CCl4) carbon (C (s) is not included since it is in solid state and does not change volume
 Ptotal = 1.9atm = P Cl2
 P CCl4 * 0.76 = (P Cl2)^2
 P CCl4 = 4.75atm

Research into nuclear fusion will likely require a large investment of time and money before it might be used as an energy source. Which statement best describes the benefits that would make the investment worthwhile?

Answers

Answer: B) Fusion produces large amounts of energy, and the fuel is found on Earth.

Explanation:

These are the statments that accompany the question:

A) Fusion requires a large amount of energy and occurs in stars.

B) Fusion produces large amounts of energy, and the fuel is found on Earth.

C) Fusion produces no radioactive waste, and the fuel is plentiful.

1D) Fusion requires little energy to begin and would continue through a chain reaction.

Answer:

Nuclear fusion is the union of smaller atom nuclei to form one bigger and more stable nucleous.

The nuclear fusion  reactions are able to release vast amounts of energy.

The energy of the Sun comes from the nuclear fusion of hydrogen atoms, H, to form, helium atoms, He.

The research into nuclear fusion is justified becasue there is plenty fuel (low atomic mass atoms like hydrogen) and the huge ability to release energy.

Also, generally, the products of the fusion reaction are not radioactive. But this is a general rule, not a 100% condition.

Therefore, although the reduction of radioactive waste is a plus, the complete justification is given by the option: B) Fusion produces large amounts of energy, and the fuel is found on Earth.

A fluid that vaporizes and condenses inside the tubing of a heat pump is called the.

Answers

I believe that is refrigerant! 
Hope this helps!
The answer is refrigerant. I have just did a full study upon the subject. I got 100% on my test.

Which feature do all adult echinoderms have?

Answers

mhmh they have smellytypes on their bodies so yeah

The common name to the family member of phylum Echinodermata of marine family is echinoderm. They are usually characterized by a five-fold symmetry, and possess an internal skeleton of calcite plates.  They are found at every ocean depth.

The features of all adult echinoderm are:

- They have a five-fold symmetry.

- Body without segmentation.

- Spiny skin.

- Internal skeleton.

- found at every ocean depth.

Consider the chemical equation in equilibrium.

CH4(g) + H2O(g) mc029-1.jpg CO(g) + 3H2(g)

What will happen to the equilibrium of this reaction if the pressure is increased?
The equilibrium will shift to the left to favor the reverse reaction.
The equilibrium will shift to the right to favor the forward reaction.
The equilibrium will not be affected by changing the pressure.
The equilibrium will not be reestablished after this kind of stress.

Answers

When pressure in a chemical reaction increases, the equilibrium will shift towards the side of the reaction with fewer moles of gas. When there is a decrease in pressure, the equilibrium will shift towards the side of the reaction with more moles of gas.Therefore; in this case; increased the Equilibrium will shift to the left and favor the reverse reaction. This is because the side of products has more moles compared to the side of reactants, thus increased in pressure will aid conversion of products to reactants. 

Answer:

The correct answer is :'The equilibrium will shift to the right to favor the forward reaction'.

Explanation:

[tex]CH_4(g) + H_2O(g) \rightleftharpoons CO(g) + 3H2(g)[/tex]

According to Le-Chatlier's principle,When the pressure is increased the equilibrium shifts in the direction where number of moles of gas molecules are greater .

The equilibrium will shift towards the product side because there are more number of moles of gas re greater on product side. So, the equilibrium will shift in the right direction favoring the forward reaction.

A beam of radiation has an energy of 2.39×10^2 kJ/mol. What is the wavelength of this light?

Answers

Final answer:

The wavelength of a radiation beam with an energy of 2.39×10² kJ/mol can be calculated using the Planck's formula. Convert the energy to J/photon, then rearrange the formula to solve for wavelength. The wavelength for this energy is approximately 501 nm.

Explanation:

The energy of a beam of radiation can be used to determine its wavelength using Planck's formula, E=hv, where E is energy, h is Planck’s constant, and v is frequency. However, since we want to find the wavelength, we can modify the formula to make use of the speed of light: E=hc/λ. Here, c denotes the speed of light, and λ is wavelength.

First, convert the energy from kJ/mol to J/photon. As Avogadro's number (6.022 × 10²³ molecules/mol) is the number of photons in one mole, the energy per photon is (2.39×10⁵ J/mol) / (6.022×10²³ photon/mol) = 3.97×10⁻¹⁹ J/photon. Now, use Planck's formula to calculate the wavelength:

λ = hc/E = (6.63×10⁻³⁴ J.s × 3.0×10⁸ m/s) / 3.97×10⁻¹⁹ J = 5.01×10⁻⁷ m = 501 nm

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For the balanced equation shown below, how many moles of O2 will react with 0.3020 moles of CO2?
2C2H5OH + 6O2 → 4CO2 + 6H2O

0.151 moles O2


0.201 moles O2


0.302 moles O2


0.453 moles O2

Answers

Answer is: 0,453  moles of oxygen will react with 0.3020 moles of carbon(IV) oxide.
n(CO₂) = 0,302 mol.
From chemical reaction: n(CO₂) : n(O₂) = 4 : 6.
n(O₂) = 6 · 0,302 mol ÷ 4.
n(O₂) = 0,453 mol.
n - amount of substance.

Answer : The number of moles of [tex]O_2[/tex] react will be, 0.453 moles

Solution : Given,

Moles of [tex]CO_2[/tex] = 0.3020 moles

The balanced chemical reaction is,

[tex]2C_2H_5OH+6O_2\rightarrow 4CO_2+6H_2O[/tex]

From the balanced reaction, we conclude that

As, 4 moles of [tex]CO_2[/tex] produces form 6 moles of [tex]O_2[/tex]

So, 0.3020 moles of [tex]CO_2[/tex] produces from [tex]\frac{6}{4}\times 0.3020=0.453moles[/tex] of [tex]O_2[/tex]

Therefore, the number of moles of [tex]O_2[/tex] react will be, 0.453 moles

given that oxygen has an atomic number of eight determine how many protons and neutrons are in the isotope 16O or oxygen -16

8 protons and 9 neutrons
8 protons and 8 neutrons
8 protons and 7 neutrons
16 protons and 0 neutrons

Answers

8 protons and 8 neutrons

Answer: Option (b) is the correct answer.

Explanation:

Atomic number is the sum of only total number of protons present in an element. Whereas mass number or atomic mass is the sum of total number of both protons and neutrons present in an element.

For example, given atom has atomic number is 8.  And, it is known that atomic mass of O is 16 g/mol.

Therefore, number of neutrons present in it will be calculated as follows.

                    Mass number = no. of protons + no. of neutrons

                         16 = 8 + no. of neutrons

                    no. of neutrons = 16 - 8  

                                               = 8

Hence, we can conclude that in the given isotope of oxygen-16 there are 8 protons and 8 neutrons.

ok, so sorry, buuuuut..... I need help with this desperately...
2. Methane (CH4), ammonia (NH3), and oxygen (O2) can react to form hydrogen cyanide (HCN) and water according to this equation:
CH4 + NH3 + O2  HCN + H2O
You have 8 g of methane and 10 g of ammonia in excess oxygen. Answer the following questions:
• What is the balanced equation for this reaction?
• Which reagent is limiting? Explain why.
• How many grams of hydrogen cyanide will be formed? Show your work.

Answers

For your questions, these are the answers:
1. 2CH4 + 2NH3 + 302 -> 2HCN + 6H2O 

2. Methane
2mole CH4 = 32g
react with 2 mole NH3 which is equal to 34g 
so,
8g CH4 react with 34/32 x 8
= 8.5g NH3 

3.  32g methane = 54g HCN (2 moles)
so,
8g CH4 = 54/32 x 8g HCN
=1.60 g HCN 
answer: 1.60 g cyanide

Answer:

See explanation

Explanation:

First, let's write the equation again.

CH4 + NH3 + O2 -----> HCN + H2O

In order to balance this equation, we need to see both sides of the reaction (Reactants and products), and count the elements and atoms there. it's usually begin with the metals, then non metals, and finally hydrogen and oxygen.

Let's begin with the Carbon and nitrogen.

In reactant we have 1 C and product the same, so theorically speaking, we don't need to balance, same thing happen with N (1 and 1).

However, when we look at H, we can see we have 7 in reactants (4 and 3) and only 3 in products (1 and 2), so we need to balance them. As we have those atoms in different compounds, we need to put a number in both compound so the sum gives an even number. In this case if we put a 2 in CH4, we'll get 8 hydrogen and the other 3, will be 11.

2CH4 + NH3 + O2 -----> HCN + H2O

To get an even number, let's put a 2 in NH3 too, the total is now 14.

2CH4 + 2NH3 + O2 -----> HCN + H2O

Let get 14 in the products, to do that we simply put a 2 in HCN and 6 in H2O.

2CH4 + 2NH3 + O2 -----> 2HCN + 2H2O

With that, we balance Hydrogen, and also Carbon and nitrogen were balanced too with this.

Now only the oxygen needs to be balanced. The 6 in H2O put the oxygen with 6, so we need to put a 3 in reactants, and with that, the equation is balanced:

2CH4 + 2NH3 + 3O2 -----> 2HCN + 6H2O

Now that we have the balanced equation, we can calculate the rest of the questions.

The limiting reagent is the reagent that it gets consumed first and completely in the reaction. To do that, we need to do stechiometry of the reagents, and the easier way to do that is with the number of moles.

moles are calculated:

n = m/MM

The molecular mass of CH4 is 16 g/mol and NH3 is 17 g/mol. According to the balanced equation, we have at least 2 moles of CH4 and 2 moles of NH3. The limiting reagent will be the reagent with the lower moles so:

nCH4 = 8/16 = 0.5 moles

nNH3 = 10/17 = 0.59 moles

We have more moles of NH3 than moles CH4, so the limiting reagent is CH4.

Now to get the mass of HCN, we need the moles. But we already know which is the limiting reagent and we know (according to the balanced reaction) that 2 moles of CH4 produces 2 moles HCN, so, the moles of CH4 are the same of HCN produced therefore:

moles CH4 = moles HCN = 0.5 moles

To get the mass we need the molecular mass of HCN which is 27 g/mol, so the mass:

m = 27 * 0.5

m = 13.5 g

This is the mass formed of HCN

Two plastics that are targeted for recycling from household waste are PETE (1) ( plastic soft drink bottles/ peanut butter and salad dressing containers) and HDPE (2) ( milk, water, juice containers/ plastic grocery bags). One of the problems of recycling such materials is separating them. Suppose you have been hired to set up a process for separating large quantities (many tons) of waste plastic that is a mixture of PETE and HDPE. Describe how you might perform this separation.

Any help would be much appreciated!

Answers

The HDPE recycling items would usually be clear or lighter in color while the PETE ones would be of color so you could separate it by this color patterns.

What is the ph at the half-stoichiometric point for the titration of 0.22 m hno2(aq) with 0.1 m koh(aq)? for hno2, ka = 4.3x10-4?

Answers

Answer:- pH = 3.37

Solution:- The balanced equation for the reaction of KOH with [tex]HNO_2[/tex] is written as:

[tex]HNO_2(aq)+KOH(aq)\rightleftharpoons KNO_2(aq)+H_2O(l)[/tex]

Nitrous acid is a weak acid and KOH is a strong base. So, at half-stoichiometric point half of the acid will be neutralized to form its conjugate base and half of the acid will still be remaining.

It means at half stoichiometric point the solution will have equal moles of weak acid(nitrous acid) and its conjugate base(nitrite ion). It will act as a buffer solution and the pH of the buffer solution is calculated by using Handerson equation:

[tex]pH=pKa+log(\frac{base}{acid}) [/tex]

Since, for the half stoichiometric point, [acid] = [base]

The ratio of their concentrations becomes 1 and the log of 1 is 0.

So, pH = pKa

pKa = - log Ka

[tex]pKa=-log(4.3*10^-^4)[/tex]

pKa = 3.37

So, pH = 3.37

Hence, the pH of the solution at half equivalence point will be 3.37.

The pH at the half-stoichiometric point for the titration of 0.22 M HNO₂(aq) with 0.1 M KOH(aq) is 3.4.

Let's consider the equation for the titration of 0.22 M HNO₂(aq) with 0.1 M KOH(aq).

HNO₂(aq) + KOH(aq) ⇒ KNO₂(aq) + H₂O(l)

At the half-stoichiometric point, we have a buffer system formed by equal concentrations of the weak acid (HNO₂) and its conjugate base (NO₂⁻).

We can calculate the pH using the Henderson-Hasselbach's equation.

[tex]pH = pKa+log(\frac{[NO_2^{-} ]}{[HNO_2]} )= pKa+log1=pKa=-log(4.3\times 10^{-4} )=3.4[/tex]

The pH at the half-stoichiometric point for the titration of 0.22 M HNO₂(aq) with 0.1 M KOH(aq) is 3.4.

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Name the type of compound produced by the hydrolysis of a protein.

Answers

By hydrolysis of a protein, amino acids and carbohydrate are formed
Final answer:

The hydrolysis of a protein results in the production of amino acids. This procedure involves the breaking of the peptide bonds within the protein using water, resulting in the formation of individual amino acids. Additionally, amino groups are converted into waste products such as urea.

Explanation:

Proteins are polymers largely composed of amino acids connected by peptide bonds. In a process known as hydrolysis, these proteins are broken down into smaller components through the introduction of water. As a result, the bonds within the protein molecule are broken, typically resulting in the formation of individual amino acids.

It's important to note that for an amino acid to participate in this breakdown procedure, its amino group must first be removed. Following this, the amino group is usually converted into ammonia. Mammalian organisms, however, convert this ammonia into a more efficient waste product known as urea.

Overall, in the hydrolysis of proteins, the primary compounds produced are amino acids, which may be further metabolized or reformed into other proteins.

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Which of the following is not an oxidation-reduction reaction?
(pictured below)

Answers

Answer is: the third reaction.
Elements in this chemical reaction do not change their oxidation number. Hydrogen has oxydation number +1, sulfur oxidation number is +6, oxygen has oxidation number -2 and barium has +2 on both sides of chemical reaction. In other reactions elements change their oxidation numbers.

the molar mass of methane is 16.04 g/mol. Calculate the number of moles of methane burned in the ecperiment,

Answers

Given: Molar mass of methane is 16.04 g/molAsked: number of moles of methane burnedSolution:If the mass of methane is 50 g, then you can calculate the number of moles.Number of moles = mass / molar mass
= 50g/16.04 g/mol
= 3.117mol methane

What volume of a 2.5 M NaOH solution is required to make 1 liter of a 0.75 M NaOH?

0.3 liter
1 liter
33 liters
3.3 liters

Answers

C1V1 =C2V2... general formula...where C is the concentration and V the volume.....
(2.5) (V1) = (0.75)(1)..
V1 = 0.3L
Final answer:

0.3 liter of the 2.5 M NaOH solution is required to make 1 liter of a 0.75 M NaOH solution.

Explanation:

To find the volume of a NaOH solution needed, we can use the formula:

(M1)(V1) = (M2)(V2)

Where:

M1 is the initial concentration of NaOH (2.5 M)V1 is the initial volume of NaOH (unknown)M2 is the final concentration of NaOH (0.75 M)V2 is the final volume of NaOH (1 L)

Plugging in the given values:

(2.5 M)(V1) = (0.75 M)(1 L)

Solving for V1:

V1 = (0.75 M)(1 L) ÷ (2.5 M) = 0.3 L

Therefore, 0.3 liter of the 2.5 M NaOH solution is required to make 1 liter of a 0.75 M NaOH solution.

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which of the following types of molecular representations can be used to show differences between isomers? Explain why each can or cannot.

a) molecular formula
b) structural formula
c) 3D drawing or model,

Answers

Isomer is defined as compounds with the same formula but different arrangement of atoms in its molecule and they differ in their properties. The representation that can be used to show differences between isomers is the use of structural formula.  It shows the arrangement of each atoms. It cant be molecular formula and 3D drawing because it does not show the arrangement of the atoms.

Final answer:

Molecular formula, structural formula, and 3D drawing or model can be used to show differences between isomers.

Explanation:

The types of molecular representations that can be used to show differences between isomers are:

Molecular formula: The molecular formula gives only the number of each kind of atom present in a molecule. It does not provide any information about the structure of the molecule. For example, the molecular formula CH4O represents methanol, but it does not reveal the arrangement of the atoms.Structural formula: The structural formula shows how the atoms are connected in a molecule. It provides information about the arrangement of atoms and the bonds between them. For example, the structural formula of methanol (CH3OH) indicates that one carbon atom is bonded to three hydrogen atoms and one oxygen atom.3D drawing or model: A 3D drawing or model represents the three-dimensional structure of a molecule. It helps in visualizing the spatial arrangement of atoms. For example, a ball-and-stick model or a space-filling model can be used to show the differences in the arrangement of atoms between isomers.

Assuming that the density of vinegar is 1.005 g/mL, calculate the molarity of acetic acid in vinegar from your average value for the mass percentage of acetic acid in vinegar. Density of vinegar= 1.005 g/mL Average mass % acetic acid= 5.2%,

Answers

Final answer:

To calculate the molarity of acetic acid in vinegar, convert the average mass percentage of acetic acid to grams, then convert grams to moles, and finally divide the moles by the volume in liters. The molarity of acetic acid in vinegar is 0.866 M.

Explanation:

To calculate the molarity of acetic acid in vinegar, we need to first convert the average mass percentage of acetic acid to grams. Assuming we have 100g of vinegar, the mass of acetic acid would be 5.2g (5.2% of 100g). Next, we need to convert grams of acetic acid to moles. The molar mass of acetic acid is 60.05 g/mol. Dividing the mass by the molar mass gives us the number of moles. Finally, we can calculate the molarity by dividing the moles by the volume in liters. Since the density of vinegar is given as 1.005 g/mL, we can assume the volume of 100g of vinegar is 100 mL, or 0.1 L.

Step 1: Convert mass percentage to grams: (5.2% x 100g) = 5.2gStep 2: Convert grams to moles: (5.2g / 60.05 g/mol) = 0.0866 molStep 3: Calculate molarity: (0.0866 mol / 0.1 L) = 0.866 M

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Final answer:

The molarity of the acetic acid in the vinegar is 0.871 M, calculated by finding the mass of acetic acid in a certain volume of vinegar and then using that to determine the number of moles of acetic acid and thus the molarity.

Explanation:

To get the molarity (M) of acetic acid in vinegar, we need to first find the mass of acetic acid in a certain volume of vinegar since molarity (M) is defined as moles of solute/liters of solution. The given data implies that 5.2% of the vinegar's mass is due to acetic acid. Hence, given vinegar's density (1.005 g/mL), in 1000 ml (or 1 liter) of vinegar, mass of vinegar = density * volume = 1.005 g/mL * 1000 mL = 1005 g. Given that 5.2% of this mass is acetic acid, mass of acetic acid is 5.2/100 * 1005 = 52.26g.

The molecular mass of acetic acid (CH3COOH) is approximately 60 g/mol. So, the number of moles of acetic acid = mass of acetic acid / molecular mass = 52.26 g / 60 g/mol = 0.871 moles. Therefore, the molarity (M) = moles of solute/liters of solution = 0.871 moles / 1 L = 0.871 M.

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Which orbital block corresponds to the transition metals in the periodic table?

Answers

On the periodic table, the orbital blocks are broken up based on section. The first two rows (Alkali Metals, Alkaline Earth Metals) are the S block, the transition metals are the D block, the nonmetals/metalloids are the P block, and the extra elements at the bottom of the periodic table are the F block. Therefore, the answer would be “The D block”. Hope this helped!

Metallurgy is the study of _____.

Answers

Hello,

The answer is "behaviors and properties of metals".

Reason:

The answer is the study of behaviors and properties of metals.

If you need anymore help feel free to ask me!

Hope this helps!

~Nonportrit
behavior of metals and its reaction

A 0.50 M solution of formic acid, HCOOH, has a pH of 2.02. Calculate the percent ionization of HCOOH

Answers

Answer is: the percent ionizationof formic acid is 1,82%.
Chemical reaction: HCOOH(aq) ⇄ H⁺(aq) + HCOO⁻(aq).
pKa(HCOOH) = 3,77.

Ka(HCOOH) = 1,7·10⁻⁴.

c(HCOOH) = 0,5 M.

[H⁺] = [HCOO⁻] = x; equilibrium concentration.
[HA] = 0,1 M - x.
Ka = [H⁺] · [HCOO⁻] / [HCOOH].
0,00017 = x² / 0,5 M - x.
Solve quadratic equation: x = 0,0091 M.
α = 0,0091 M ÷ 0,5 M · 100% = 1,82%.

Answer : 1.91 %

Explanation : The steps to solve this problem are explained below;

1.  HCOOH ⇄ [tex]HCOO^{-} + H^{+} [/tex]      

Here Ka =([tex] [HCOO^{-}]_{eq} X  [H^{+}]_{eq} [/tex] )/  [tex][HCOOH]_{eq}[/tex]                                                        

As the equilibrium concentration of [tex] H^{+} [/tex] will be the pH of the solution.

∴ [tex] [H^{+}]_{eq}[/tex] = [tex]10^{(-2.02)} = 9.55 x [tex] 10^{-3} [/tex] M  

2. The initial concentration of HCOOH.  When it loses x moles from it as the acid undergoes dissociation to form [tex]HCOO^{-}[/tex] and [tex]H^{+}[/tex].  

3.  The moles present will be as

         [HCOOH] (M)                 [tex] [H^{+}] [/tex](M)           [tex][HCOO^{-}] [/tex](M)  

Initial       0.50                                0.00                                          0.00


After Change  -x                              +x                                            +x


Equilibrium      ( 0.50 -x)                     x                                              x



∴ Ka   =   (x) x (x)  / (0.50 - x)  

4.  Assuming that all of the [tex] H^{+}[/tex] comes from the acid, and none from water.  

As [tex] [H^{+}]_{eq}[/tex] = 9.55 x[tex]  10^{-3}[/tex] which is much higher than the 1.0 x[tex]  10^{-7 } [/tex] M [tex[H^{+}[/tex] from water.  

Also, the concentration of HCOOH will change very little, from 0.50  to 0.50 - 9.55 x [tex] 10^{-3}[/tex].  

The change in concentration can be ignored if it is less than 5% of the original concentration.  

∴ 0.50 M x 5% = 0.025, so the change in [HCOOH] in this problem can be ignored.    

Now,  Ka = (x)(x)/0.50 = (9.55 x [tex] 10^{-3})^{2}[/tex] /0.50= 1.82 x [tex] 10^{-4}[/tex]


Now, calculating the percent ionization for this problem.  

which will represent the relative number of acid molecules which dissociate. It is calculated as :


[tex] [H^{+}]_{eq} [/tex] x  100 /[tex] [HCOOH]_{i}[/tex]                                                        

∴ percent ionization = {(9.55 x [tex] 10^{-3})[/tex]/ (0.50)}x 100 = 1.91 %


This value of 1.91 % indicates that very little of this acid dissociates (ionizes) under these conditions.  

For strong acids and bases, the percent ionization is 100%.

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