Average bond energies (in kJ·mol ): C–H 413, Cl–Cl 243, C–Cl 328, H–Cl 431

CHEMISTRY · Subjective · A Level · Chemistry · Energetics · Energetics

Problem

Average bond energies (in kJ·mol

^{-1}

): C–H 413, Cl–Cl 243, C–Cl 328, H–Cl 431. Calculate the enthalpy change

\Delta H

for the reaction CH

_4

(g) + Cl

_2

(g) \rightarrow CH

_3

Cl(g) + HCl(g), and state whether the reaction is endothermic or exothermic.