4.7b


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

4.7b

Postby Alicia Lin 2F » Fri Jan 31, 2020 9:05 pm

(a) Calculate the work that must be done against the atmosphere for the expansion of the gaseous products in the combustion of 1.00mol C6H6 (l) at 25°C and 1.00 bar. (b) Using data in Appendix 2A, calculate the standard enthalpy of the reaction. (c) Calculate the change in internal energy, ΔU, of the system.


For part b, I took the sum of the standard enthalpies of formations for the products and subtracted the sum of the standard enthalpies for reactants. I got -3135.52 kJ/mol. The book says the answer is -3267.5 kJ/mol. Am I missing a step? Or did I go about this problem wrong?

Brian_Ho_2B
Posts: 221
Joined: Fri Aug 09, 2019 12:16 am

Re: 4.7b

Postby Brian_Ho_2B » Sat Feb 01, 2020 1:58 am

There is a chart in the book that lists the standard reaction enthalpies of different combustion reactions. On a side note, how did you do part A of 4.7? I've been stuck on why the answer is 3.72 kJ


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