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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 mol1 and the estimated ΔH of sublimation in the absence of hydrogen bonding is 14.4kJ mol1. What is the strength of hydrogen bond in solid ammonia in kJ mol1? Give your answer in nearest integer number.

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Solution

6 hydrogen bonds are between two ammonia molecules. Each ammonia molecule can form 3 hydrogen bonds with neighbours.
The strength of hydrogen bond in solid ammonia is 30.814.4kJ/mol3kJ/mol5kJ/mol

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