anonymous
  • anonymous
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
Chemistry
  • Stacey Warren - Expert brainly.com
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chestercat
  • chestercat
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taramgrant0543664
  • taramgrant0543664
Any guesses?
anonymous
  • anonymous
@taramgrant0543664 not at all lol im taking a class with JUST tests and quizzes and no lessons or anything
taramgrant0543664
  • taramgrant0543664
Ok well delta Hf is found by products minus reactants

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taramgrant0543664
  • taramgrant0543664
So for number 1 there you are looking for the reactants
anonymous
  • anonymous
@taramgrant0543664 so would it be B. HCl (g)?
taramgrant0543664
  • taramgrant0543664
HCl is the product of the reaction the reactants are the things that form the products
anonymous
  • anonymous
@taramgrant0543664 oh so wait it would actually be C?
taramgrant0543664
  • taramgrant0543664
Yes it would be
taramgrant0543664
  • taramgrant0543664
Any guesses for the second one?
anonymous
  • anonymous
@taramgrant0543664 for the second one im guessing it would be add 2 but am not sure
taramgrant0543664
  • taramgrant0543664
No it would not be add two. There are twice the amount of reactants so Hf should be twice the amount
anonymous
  • anonymous
@taramgrant0543664 ohhh so multiply 2!
taramgrant0543664
  • taramgrant0543664
Yes it would be
taramgrant0543664
  • taramgrant0543664
For the last one since you are reversing the reaction so essentially you are flipping it any idea what it could be?
taramgrant0543664
  • taramgrant0543664
Flipping is the key word there
taramgrant0543664
  • taramgrant0543664
@twelveroses i have to go now but do you have an idea on what it is?
anonymous
  • anonymous
@taramgrant0543664 no i dont im trying to figure out what the formula is for hess's law calculations :/
taramgrant0543664
  • taramgrant0543664
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
taramgrant0543664
  • taramgrant0543664
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!!
anonymous
  • anonymous
its okay thank you!!

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