Consider the reaction

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

Problem

\mathrm{CH_4(g) + 2\,F_2(g) \rightarrow CH_2F_2(g) + 2\,HF(g)}

. Average bond energies (in

\text{kJ mol}^{-1}

): C–H: 413 C–F: 485 F–F: 155 H–F: 565 Calculate

\Delta H

for the reaction as written, expressing your answer to the nearest

\text{kJ}