From the following enthalpy changes,
H2 (g) + 1/2O2 (g) –> H2O (l) ?H�= -285.8 kJ
N2O5 (g) + H2O (l) –> 2 HNO3 (l) ?H�= -76.6 kJ
1/2N2 + 3/2(O2) (g) +1/2H2 (g) –> HNO3 (l) ?H�= -174.1 kJ
Calculate the value of ?H� for the reaction:
2 N2 (g) + 5 O2 (g) –> 2 N2O5 (g)
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