4D.21c

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Alicia Lin 2F
Posts: 83
Joined: Wed Sep 18, 2019 12:17 am

4D.21c

Postby Alicia Lin 2F » Mon Jan 27, 2020 8:53 pm

Use standard enthalpies of formation from Appendix 2A to calculate the standard reaction enthalpy for:
(c) the formation of a sulfide by the action of hydrogen sulfide on an aqueous solution of a base:
H2S(aq)+2KOH(aq)→K2S(aq)+2H2O(l).

I calculated this by taking sums of standard enthalpies of formation of the products and subtracted the sum of the standard enthalpies of formation of the reactants. I got -38.72 kJ. However, the answer key says the answer should be 15.28 kJ. I used the same steps to get the answers for part a and b and got the answer right. Does the answer key have an error in it?

Hannah Lee 2F
Posts: 117
Joined: Thu Jul 11, 2019 12:15 am

Re: 4D.21c

Postby Hannah Lee 2F » Tue Jan 28, 2020 9:51 pm

I also got -38.72 kJ/mol so I think it may be an error in the answer key, though I'm not completely sure because it's not on the list of solutions manual errors.


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