Using the average bond energies given below

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

Problem

Using the average bond energies given below, calculate the approximate ΔH (to the nearest 10 kJ mol

^{-1}

) for the gas-phase reaction CO

_2

(g) + H

_2

(g) → CO(g) + H

_2

O(g). Indicate whether the reaction is exothermic or endothermic. Average bond energies (kJ mol

^{-1}

): C=O (in CO

_2

) 799 C≡O 1072 H–H 436 O–H 463