Question
In solid ammonia, each NH3 molecule has six other NH3 molecules as nearest neighbours. ΔH of sublimation of NH3 at the melting point is 30.8kJ mol−1 and the estimated ΔH of sublimation in the absence of hydrogen bonding is 14.4kJ mol−1. What is the strength of hydrogen bond in solid ammonia in kJ mol−1? Give your answer in nearest integer number.