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July 5, 2015

Homework Help: chem urgent!

Posted by hannah on Tuesday, November 6, 2012 at 10:20am.

Set up a Hess's law cycle, and use the following information to calculate ÄH°f for aqueous nitric acid, HNO3(aq). You will need to use fractional coefficients for some equations.

3 NO2(g) + H2O(l) 2 HNO3(aq) + NO(g) ÄH° = -138.4 kJ
2 NO(g) + O2(g) 2 NO2(g) ÄH° = -114 kJ
4 NH3(g) + 5 O2(g) 4 NO(g) + 6 H2O(l) ÄH° = -1169.6 kJ
NH3(g) ÄH°f = -46.1 kJ/mol
H2O(l)

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