8.115 part b

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Garret G 2F
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Joined: Fri Sep 29, 2017 7:06 am

8.115 part b

Postby Garret G 2F » Mon Jan 22, 2018 11:58 am

If we know that ~14.73 moles of H2 were burned in a combustion reaction and that the temperature (298K) and Volume (30L) did not change, just the pressure (16 atm to 4 atm), How do we find the heat given off in the reaction? Do we need to look up the enthalpy of this reaction?

Andrea ORiordan 1L
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Re: 8.115 part b

Postby Andrea ORiordan 1L » Mon Jan 22, 2018 12:20 pm

For this problem, you use the value from a table of enthalpies of combustion (I believe in Appendix 2A). The enthalpy of combustion for H2 is -286kJ/mol. Multiplying that by 14.7 moles, you get -4.20*10^3 kJ.

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