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April 24, 2014

Homework Help: chem- i reallyneed help

Posted by hannah on Tuesday, November 6, 2012 at 10:30am.

Consider the following equations.
N2H4(l) + O2(g) N2(g) + 2 H2O(l) ÄH = -622.2 kJ
H2(g) + 1/2 O2(g) H2O(l) ÄH = -258.5 kJ
H2(g) + O2(g) H2O2(l) ÄH = -187.8 kJ

Use this information to calculate the enthalpy change for the reaction shown below.

N2H4(l) + 2 H2O2(l) N2(g) + 4 H2O(l) ÄH = ?



i really do0nt know how to do these

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