3. Given the following information, calculate Delta Hrxn for the overall equation: 2NO2(g) + 1/2O2(g) → N2O5(5)
N2O5(s) + 2NO(g) + 3/2 O2(e); deltaH=223.7 kJ/mol
NO(g) + 1/2O2(g) → NO2(g) ; deltaH=-55.1kj/mol
AH = 223.7 kJ/mol
AH = - 55.1 kJ/mol

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