1.) To calculate the enthalpy of the reaction, H2 (g) + Cl2 (g) → 2HCl (g), you need to subtract which heats of formation? a. HCl (g) and H2 (g) b. HCl (g) c. H2 (g) and Cl2 (g) d. none of them 2.) When calculating the enthalpy of a reaction, if the reactant has a coefficient of 2, what must be done to the ΔHf value of the reactant? a. Divide by 2 b. Multiply by 2 c. Add 2 d. Subtract 2 3.) If the reaction is reversed during a Hess’s law calculation, what must be done to the ΔH for that reaction? a. It must be left alone b. It must be multiplied by 1 c. The sign must change d. the sign must not change

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1.) To calculate the enthalpy of the reaction, H2 (g) + Cl2 (g) → 2HCl (g), you need to subtract which heats of formation? a. HCl (g) and H2 (g) b. HCl (g) c. H2 (g) and Cl2 (g) d. none of them 2.) When calculating the enthalpy of a reaction, if the reactant has a coefficient of 2, what must be done to the ΔHf value of the reactant? a. Divide by 2 b. Multiply by 2 c. Add 2 d. Subtract 2 3.) If the reaction is reversed during a Hess’s law calculation, what must be done to the ΔH for that reaction? a. It must be left alone b. It must be multiplied by 1 c. The sign must change d. the sign must not change

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Any guesses?
@taramgrant0543664 not at all lol im taking a class with JUST tests and quizzes and no lessons or anything
Ok well delta Hf is found by products minus reactants

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So for number 1 there you are looking for the reactants
@taramgrant0543664 so would it be B. HCl (g)?
HCl is the product of the reaction the reactants are the things that form the products
@taramgrant0543664 oh so wait it would actually be C?
Yes it would be
Any guesses for the second one?
@taramgrant0543664 for the second one im guessing it would be add 2 but am not sure
No it would not be add two. There are twice the amount of reactants so Hf should be twice the amount
@taramgrant0543664 ohhh so multiply 2!
Yes it would be
For the last one since you are reversing the reaction so essentially you are flipping it any idea what it could be?
Flipping is the key word there
@twelveroses i have to go now but do you have an idea on what it is?
@taramgrant0543664 no i dont im trying to figure out what the formula is for hess's law calculations :/
You don't need the formula for the question but all it is is delta Hf equals the sum of heats for the products minus the sum of heats for the reactants
For number three if you are going in the positive direction and you reverse the reaction you're going to be going in the negative direction now. I'm sorry I have to go now though!!
its okay thank you!!

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