Tuesday
September 16, 2014

Homework Help: Chemistry II

Posted by Mandy on Sunday, November 29, 2009 at 6:37pm.

Calculate the enthalpy for the following reaction: 4 NH3 (g) + 5 O2 (g) into 4 NO (g) + 6 H2O (g).
You may only use the following information:
N2 (g) + O2 (g) into 2 NO (g); Delta Hf = 180.6 kJ
N2 (g) + 3 H2 (g) into 2 NH3 (g); Delta Hf = -91.8 kJ
2 H2 (g) + O2 (g) into 2 H2O (g); Delta Hf = -483.7 kJ

My answer was -910.6 KJ but the real answer was -918.3 KJ. I need to know what I am doing wrong.

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