Calculate the standard reaction enthalpy

for the oxidation of nitric oxide to nitrogen dioxide

2 NO(g) + O2(g) → 2 NO2(g)

given N2(g)+O2 →2NO(g)

∆H◦ = +180.5 kJ · mol−1 2 NO2(g) → N2(g) + 2 O2(g)

∆H◦ = −66.4 kJ · mol−1

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