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Calculate Δ*H* for

2NOCl (g) ⟶ N_{2} (g) + O_{2} (g) + Cl_{2} (g)

given the following reactions:

1/2N_{2} (g) + 1/2O_{2} (g) ⟶ NO (g) Δ *H* = 90.3 kJ

NO (g) + 1/2Cl_{2} (g) ⟶ NOCl (g) Δ *H* = −38.6 kJ

Hess's Law