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August 2, 2015

Homework Help: Chemistry help

Posted by Anonymous on Sunday, May 11, 2014 at 12:10pm.

I am not to sure how to approach the problem...

Hydrazine is used as a rocket fuel because its reaction with oxygen is extremely exothermic:
N2H4(liquid) + O2(g) ==> N2(g) + 2H2O(liquid) ΔH(reaction) = -615 kJ mol-1
What is the enthalpy of this reaction if water were produced in the gaseous rather than the liquid form? Note that 40.7 kJ mol-1 is the molar enthalpy of vaporization of water.

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