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September 19, 2014

Homework Help: AP CHEMISTRY NEED HELP PLEASE!

Posted by Mandy on Tuesday, January 24, 2012 at 10:34pm.

Calculate the enthalpy of combustion of C3H6:
C3H6 (g) + 9/2 O2 (g) yield 3CO2 + 3H2O
using the following data:
3C (s) + 3H2 (g) yield C3H6 (g) change in H= 53.3 kJ

C(s)+O2 (g) yield CO2 (g) change in H= -394kJ

H2 (g) + 1/2 O2 (g) yield H2O (l) change in heat= -286 kJ

CHoices are
(a) -1517 kJ
(b) 1304 kJ
(c) -626 kJ
(d) -2093

I got answer b.

Can anyone please help me. Have a huge exam tomorrow. Teacher has been out sick and sub is no help. Thanks

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