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Topic: Hess's Law  (Read 1920 times)

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Offline Starfoth

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Hess's Law
« on: October 21, 2012, 06:53:59 PM »
I am given the enthalpies of combustion C=-393.5, H2=-285.8, C2H5(OH(=-1366.7

I need to find the standard enthalpy change (deltaH) of the reaction;
2C+2H2+H20(l)->C2H5(OH)

I keep getting 293.9, but i'm not sure if this is correct.
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Offline Schrödinger

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Re: Hess's Law
« Reply #1 on: October 22, 2012, 03:55:15 AM »
Please show us the individual chemical equations you used to calculate the heats and arrive at the final given reaction.
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Offline Aegis6

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Re: Hess's Law
« Reply #2 on: October 24, 2012, 06:05:56 PM »
I am not sure how you reached your conclusion, due to your lack of work, but when I ran through the problem I got 7.7kJ/mol Rxn.
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