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Given that Bond energies of \( \mathrm{H}_{2} \) and \( \mathrm{N}_{2} \) are \( 400 \mathrm{~kJ} \)
P \( \mathrm{mol}^{-1} \) and \( 240 \mathrm{~kJ} \mathrm{~mol}^{-1} \) respectively and \( \Delta \mathrm{H}_{\mathrm{f}} \) of \( \mathrm{NH}_{3} \)

W is \( -120 \mathrm{~kJ} \mathrm{~mol}^{-1} \). Calculate the bond energy of \( \mathrm{N}-\mathrm{H} \) bond:
(1) \( 300 \mathrm{~kJ} \mathrm{~mol}^{-1} \)
(2) \( 250 \mathrm{~kJ} \mathrm{~mol}^{-1} \)
(3) \( 410 \mathrm{~kJ} \mathrm{~mol}^{-1} \)
(4) \( 280 \mathrm{~kJ} \mathrm{~mol}^{-1} \)
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