Given the following thermochemical equations,
NO(g) + O3(g) →NO2(g) + O2(g)
ΔH = −198.9 kJ/mol
O3(g) →3/2O2(g
ΔH = −142.3 kJ/mol
O2(g) → 2O(g)
ΔH = +495 kJ/mol
determine the enthalpy change for the reaction
2NO2(g) →2NO(g) + O2(g)
 ΔH =  kJ/mol

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