CH-1219

Bond energies

Chemistry · Secondary 4 · Hard · Bond energies

In the Haber Process, nitrogen reacts with hydrogen according to the equation:

N_2(g) + 3H_2(g) \rightarrow 2NH_3(g)

.

Using the bond energies:

N\equiv N = 945\,\text{kJ/mol}

H-H = 436\,\text{kJ/mol}

N-H = 391\,\text{kJ/mol}

, calculate the overall energy change,

\Delta H

, for the reaction.

(Take

\Delta H = \text{energy of bonds broken} - \text{energy of bonds formed}

Loading problem…