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Topic: Given the following equations use Hess's Law to determine the enthalpy of rxn  (Read 1436 times)

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Offline bailey98

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Given the following equations use Hess's Law to determine the enthalpy of rxn
« on: November 03, 2012, 04:59:32 PM »
CO + 3H2 ---> CH4 + H20  Solve delta H?

1)H2 + 1/2O2 ---> H2O             DELTA H= -241.8 kJ
2) CO + 1/2 O2 ---> CO2           DELTA H= -283 kJ
3) 2CO + 2H2 ---> CH4 + CO2    DELTA H= -247.1 kJ

Explanations of steps would be appreciated
The answer should be -205.9kJ

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Offline XGen

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Re: Given the following equations use Hess's Law to determine the enthalpy of rxn
« Reply #1 on: November 03, 2012, 10:40:04 PM »
What does Hess's Law mean? How can you apply it to this scenario?
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