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Enthalpy of the decomposition reaction of N2H4 gas

 
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Jan28-13, 01:26 AM   #1
 

Enthalpy of the decomposition reaction of N2H4 gas

I am trying to determine the change of heat for:

N2H4(g) -> N2(g) + 2H2(g)

Here is what I did and what I got the correct answer is -86.0 which I am clearly not getting

[(163)+ (2*436)] - [(4*391) + (163)] = -692

thanks for any help!
 
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Jan28-13, 10:12 AM   #2
 
Where have all these numbers come from?
 
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