A-LevelChemistryChemical energetics9701/12 · May/June 2022 · Q91 Mark
The standard enthalpy of formation of NO₂(g) is +33.2 kJ mol⁻¹. The standard enthalpy of formation of N₂O₄(g) is +9.2 kJ mol⁻¹. What is the standard enthalpy change for the reaction 2NO₂(g) → N₂O₄(g)?
A−57.2 kJ mol⁻¹
B−24.0 kJ mol⁻¹
C+42.4 kJ mol⁻¹
D+75.6 kJ mol⁻¹
✓ Correct answer
A: −57.2 kJ mol⁻¹
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