The enthalpy of formation of is

CHEMISTRY · Numerical · A Level · Chemistry · Energetics · Energetics

Problem

The enthalpy of formation of

XY

-100\ \mathrm{kJ\,mol^{-1}}

. If the bond dissociation enthalpies of

X_2

and

Y_2

are

20

and

40\ \mathrm{kJ\,mol^{-1}}

, respectively, then the bond dissociation enthalpy of

XY

, in

\mathrm{kJ\,mol^{-1}}

, is