The Decomposition of NO and NO₂ to the Elements Proceeds

question 23

Multiple Choice

The decomposition of NO and NO₂ to the elements proceeds via the following two reactions.
2NO(g) → N₂(g) + O₂(g) DH°rxn = -180 kJ
2NO₂(g) → N₂(g) + 2O₂(g) DH°rxn = -66.4 kJ
Calculate the enthalpy change for the reaction
2NO(g) + O₂(g) → 2NO₂(g)

• A) 244 kJ
• B) -244 kJ
• C) -114 kJ
• D) -293 kJ
• E) none of the above

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