Using Hess's Law,what Is ΔH°_rxn for the Following Reaction? NO(g)

question 73

Multiple Choice

Using Hess's law,what is ΔH°_rxn for the following reaction? NO(g) + O(g) → NO₂(g)
NO(g) + O₃(g) → NO₂(g) +O₂(g) ΔH°_rxn = -198.8 kJ/mol
O₃(g) → 3/2 O₂(g) ΔH°_rxn = -142.2 kJ/mol
O₂(g) → 2O(g) ΔH°_rxn = +498.8 kJ/mol

• A)-839.8 kJ/mol
• B)-306.0 kJ/mol
• C)157.9 kJ/mol
• D)394.9 kJ/mol
• E)442.3 kJ/mol

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