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Covalent Bond

The bond enth...

Question

The bond enthalpy of H2 (g) is 436 KJ per mile and that of N2 (g) is 941.3 KJ per mole. Calculate the average bond enthalpy of an N-H bond in ammonia. Given enthalpy of formation of NH3 = -46 KJ per mole.

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Solution

1/2N₂ + 3/2H₂ --> NH₃ ................. ΔH = -46 kJ

+470. 65 +654 - (3NH) = -46

N-H = 390.55 kJ

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