May/June 2026 Paper 13

2026 · 40 questions · 40 parts · 40 marks

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8Enthalpy Cycles Bond EnthalpiesMedium1 mark

Bond energy data can be used to calculate the enthalpy change of a reaction.

Bromoethane, CH

_{3}

_{2}

Br, can be made by reacting ethene with hydrogen bromide.

C H_{2} = C H_{2} + H B r \to C H_{3} C H_{2} B r

bond	energy / kJ mol $^{- 1}$
$C = C$	610
C-C	350
C-H	410
C-Br	280
H-Br	366

What is the enthalpy change for this reaction?