In solid ammonia- each NH3 molecule has six other NH3 molecules as nearest neighbours- - H of sublimation of NH3 at the melting point is 30-8kJ mol -1 and the estimated - H 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-

6 hydrogen bonds are between two ammonia molecules. #160;Each ammonia molecule can form 3 hydrogen bonds with neighbours. #160;The strength of hydrogen bond ...

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Standard XII

Chemistry

Factors Affecting Hydrogen Bonding

In solid ammo...

Question

In solid ammonia, each ${N H}_{3}$ molecule has six other ${N H}_{3}$ molecules as nearest neighbours. $Δ H$ of sublimation of ${N H}_{3}$ at the melting point is $30.8 k J$ ${m o l}^{- 1}$ and the estimated $Δ H$ of sublimation in the absence of hydrogen bonding is $14.4 k J$ ${m o l}^{- 1}$ . What is the strength of hydrogen bond in solid ammonia in $k J$ ${m o l}^{- 1}$ ? 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 $\frac{30.8 - 14.4 k J / m o l}{3 k J / m o l} ≃ 5 k J / m o l$

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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 30.8−14.4kJ/mol3kJ/mol≃5kJ/mol

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 $\frac{30.8 - 14.4 k J / m o l}{3 k J / m o l} ≃ 5 k J / m o l$