Consider the chlorination reaction CH_4(g)+Cl_2(g) ; ;CH_3Cl(g)+HCl(g) Average bond…

CHEMISTRY · Single correct · A Level · Chemistry · Energetics · Energetics

Problem

Consider the chlorination reaction

\mathrm{CH_4(g)+Cl_2(g)\;\rightarrow\;CH_3Cl(g)+HCl(g)}

Average bond energies (kJ mol

^{-1}

): C–H = 413; Cl–Cl = 243; C–Cl = 328; H–Cl = 431. What is the enthalpy change per mole of

\mathrm{CH_3Cl}

produced? (a)

+103\ \text{kJ\,mol}^{-1}

(b)

-346\ \text{kJ\,mol}^{-1}

(c)

-103\ \text{kJ\,mol}^{-1}

(d)

+225\ \text{kJ\,mol}^{-1}