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anonymous

  • one year ago

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. taramgrant0543664
    • one year ago
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    Any guesses?

  2. anonymous
    • one year ago
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    @taramgrant0543664 not at all lol im taking a class with JUST tests and quizzes and no lessons or anything

  3. taramgrant0543664
    • one year ago
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    Ok well delta Hf is found by products minus reactants

  4. taramgrant0543664
    • one year ago
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    So for number 1 there you are looking for the reactants

  5. anonymous
    • one year ago
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    @taramgrant0543664 so would it be B. HCl (g)?

  6. taramgrant0543664
    • one year ago
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    HCl is the product of the reaction the reactants are the things that form the products

  7. anonymous
    • one year ago
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    @taramgrant0543664 oh so wait it would actually be C?

  8. taramgrant0543664
    • one year ago
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    Yes it would be

  9. taramgrant0543664
    • one year ago
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    Any guesses for the second one?

  10. anonymous
    • one year ago
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    @taramgrant0543664 for the second one im guessing it would be add 2 but am not sure

  11. taramgrant0543664
    • one year ago
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    No it would not be add two. There are twice the amount of reactants so Hf should be twice the amount

  12. anonymous
    • one year ago
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    @taramgrant0543664 ohhh so multiply 2!

  13. taramgrant0543664
    • one year ago
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    Yes it would be

  14. taramgrant0543664
    • one year ago
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    For the last one since you are reversing the reaction so essentially you are flipping it any idea what it could be?

  15. taramgrant0543664
    • one year ago
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    Flipping is the key word there

  16. taramgrant0543664
    • one year ago
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    @twelveroses i have to go now but do you have an idea on what it is?

  17. anonymous
    • one year ago
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    @taramgrant0543664 no i dont im trying to figure out what the formula is for hess's law calculations :/

  18. taramgrant0543664
    • one year ago
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    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

  19. taramgrant0543664
    • one year ago
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    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!!

  20. anonymous
    • one year ago
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    its okay thank you!!

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