IB skill practice

Use bond enthalpies and Hess cycles

Syllabus-aligned Chemistry skill. Draft skills remain inactive until production seed coverage is added.

Paper 1, Paper 2 5 marks Difficulty 4

Bond enthalpy estimate

A bond-enthalpy estimate in a green chemistry lesson has bonds broken \(1040\,\text{kJ mol}^{-1}\) and bonds formed \(1095\,\text{kJ mol}^{-1}\). Calculate \(\Delta H\). Enter the answer and choose the interpretation that matches the chemistry.

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