- Calculate ΔHf for HCN(g) at 25°C, given the following related reaction at 25°C,
2 NH3(g) + 3 O2(g) + 2 CH4(g) —> 2 HCN(g) + 6 H2O(g); ΔHrxn = -870.8 kJ
and the heats of formation of some species are ΔHf = -80.3 kJ/mol for NH3(g), -74.6 kJ/mol for CH4, and -241.8 kJ/mol for H2O(g). Answers are in kJ/mol.
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