Using the average bond energies below (in kJ·mol )

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

Problem

Using the average bond energies below (in kJ·mol

^{-1}

), determine the enthalpy change

\Delta H

for the reaction 2 NO

_2

(g) \rightarrow N

_2

_4

(g). Bond energies: N=O double 607, N–O single 201, N–N single 160. Provide

\Delta H

per mole of reaction and indicate whether the reaction is endothermic or exothermic.