A-LevelChemistryChemical energeticsMay/June 2014Paper 1 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?
A187 kJ mol⁻¹
B315 kJ mol⁻¹
C351 kJ mol⁻¹
D946 kJ mol⁻¹
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The correct answer is B. This question tests the candidate's understanding of chemical energetics within the Chemistrysyllabus. The examiner's mark scheme requires...
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