Average bond energies (in kJ·mol ): H–H 436, Cl–Cl 243, H–Cl 431

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

Problem

Average bond energies (in kJ·mol

^{-1}

): H–H 436, Cl–Cl 243, H–Cl 431. Using these values, calculate the enthalpy change

\Delta H

for the reaction H

_2

(g) + Cl

_2

(g) \rightarrow 2 HCl(g). Report

\Delta H

per mole of reaction, including its sign.