21 Which mathematical expression represents the heat of reaction for a chemical reaction?(1) (the heat of fusion) – (the heat of vaporization)(2) (the heat of vaporization) – (the heat of fusion)
(3) (the potential energy of the products) – (the potential energy of the reactants)
(4) (the potential energy of the reactants) – (the potential energy of the products)

Answers

Answer 1

Answer: Correct Answer: Option 3 i.e. (the potential energy of the products) – (the potential energy of the reactants)

Reason:
Heat of reaction for a chemical reaction is the change in the enthalpy of a chemical reaction that occurs at a constant pressure. This can be measured on the basis of potential energy of reactants and products. Mathematically, it is expressed as:

Heat of reaction = ΔH = ΣH products - ΣHr reactants.

Answer 2

Answer: The answer is (3) the potential energy of the products - the potential energy of the reactants. The reaction energy production can be represented by the change of energy of products and reactants.

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4. HOW MANY MOLECULES ARE IN 1.5 MOL OF SULFUR TRIOXIDE?

Answers

Sulfur trioxide is SO3
Now to find number of particles we take number of moles x avogadros number.
1.5 x (6.02x10^23) = 9.03x10^23 molecules

A substance with a definite shape and volume is a ___ phase of matter

Answers

Explanation:

Matter in which molecules have strong force of attraction are held tight together. Therefore, to break this force of attraction strong force is required.

This type of matter is know as solid. Also, it is known that solid substances have definite shape and volume.

Thus, we can conclude that a substance with a definite shape and volume is a solid phase of matter.

I would say solid shape of matter.

Is aluminum rusting physical or chemical change

Answers

chemical because it can not be changed like cutting a piece of paper

Rusting is a chemical change .

My reason being is because the physical shape and structure of the object doesn't change.

The color , appearance , or look may change and if that happens than its a chemical change.

______________________________________________________

Example :

Since the aluminum is rusting it probably turned red or orange , but the shape and size is still the same.

I really hope that this helps you out a lot , have a nice day.

What is the total number of protons contained in the nucleus of a carbon 14 atom

Answers

A carbon 14 atom would have two more neutrons than a carbon 12 atom but they would both still have 6 protons

How many moles of oxygen are produced when 8 moles of Al are produced?

Answers

Answer:

i think its 6 bru

Explanation:

Answer:

its 6

Explanation:

got it right on engenuity

Enter the the ksp expression for the solid ab2 in terms of the molar solubility x.

Answers

The Ksp Expression for the given solid in molar solubility terms is; Ksp = 4x³

What is the expression of Molar Solubility?

Ksp is simply defined as solubility product constant and it is the equilibrium expression for the dissolving of a solid.

Now, the solid ab₂ dissolved as shown in the formula;

ab₂(s) → a(aq) + 2b(aq)

Thus, the equilibrium constant is;

Ksp = ([a][b]²)/[ab₂]

Now, since the solids are not put into the equation as a result of not having enough concentration, it can be simplified to;

Ksp = [a][b]².

Now, Molar solubility another term for molarity and as such it means we will say; x = a

Since b = 2x, there is twice the amount of b than a and as such we can write a and b in terms of x to get;

Ksp = [x][2x]² = 4x³

Read more about Molar Solubility at; brainly.com/question/9732001

Ksp is the equilibrium expression for the dissolving of a solid. The solid ab2 dissolved with the formula ab2(s)-->a(aq)+2b(aq) so the equilibrium comstant is K=([a][b]^2)/[ab2] and since solids are not put into the equation due to the fact that solids don't really have a concentration, it simplifies to K=[a][b]^2. Since Ksp is is how much solute can dissolve at equilibrium Ksp=[a][b]^2. Molar solubility is just another way of saying molarity so if you make x=a you know that b=2x since there is twice the amount of b than a. With those values for a and b in terms of x you can make Ksp=[x][2x]^2 which means that Ksp=4x^3. I hope that helps. Let me know if anything is unclear.

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