A-LevelChemistryChemical energetics9701/12 · May/June 2014 · Q111 Mark
The diagram shows the skeletal formula of cyclopropane. [Figure 11.1] The enthalpy change of formation of cyclopropane is +53.3 kJ mol⁻¹ and the enthalpy change of atomisation of graphite is +717 kJ mol⁻¹. The bond enthalpy of H−H is 436 kJ mol⁻¹ and of C−H is 410 kJ mol⁻¹. What value for the average bond enthalpy of the C−C bond in cyclopropane can be calculated from this data?
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
A187 kJ mol⁻¹
B315 kJ mol⁻¹
C351 kJ mol⁻¹
D946 kJ mol⁻¹
✓ Correct answer
B: 315 kJ mol⁻¹
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