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October 21, 2014

Homework Help: Chemistry

Posted by Lucy on Monday, December 24, 2007 at 5:28pm.

Calculate the enthalpy change for the reaction 2C + H2 yield C2H2 given the following reactions and their respective enthalpy changes:

C2H2 + 5/2 O2 yield 2CO + H2O -1299.6
C + O yield CO2 -393.5
H2 + 1/2 O2 yield H2O -285.9

I don't even know how to start and the example in the book doesn't explain anything!!!!

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