February 28, 2017

Homework Help: chemistry

Posted by anna on Saturday, March 26, 2011 at 9:13pm.


I can't figure out how to start this one. I know I need to figure out the proportions or something of that sort. Any help is greatly appreciated Thanks!

Calculate ĢH for the reaction
NO(g) + O(g) ¨ NO2(g)

given the following:

NO(g) + O3(g) ¨ NO2(g) + O2(g)
ĢH = -198.9 kJ

O3(g) ¨ 3/2 O2(g)
ĢH = -142.3 kJ

O2(g) ¨ 2O(g)
ĢH = 495.0 kJ

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