Home
Class 11
CHEMISTRY
In solid NH(3) each NH(3) molecule has s...

In solid `NH_(3)` each `NH_(3)` molecule has six other `NH_(3)` molecules as nearest neighbouts. `DeltaH` of sublimation of `NH_(3)` at the melting point is `30.8 kJ mol^(-1)` and the estimated `DeltaH` of sublimation in the absence of `H-` bonding is `14.4kJ mol^(-1)`. What is the strength of a hydrogen bond in solid ammonia ?

Text Solution

Verified by Experts

Total strength of all `H-` bonds `=30.8-14.4`
`16.4k J mol^(-1)`
There are 6 nearest neghbours, but each `H-` bond involves 2 molecules, thus
No. of `H-` bond `=(6)/(2)=3`
`:. ` Strength of `H-` bond `=(16.4)/(3)=5.5 kJ mol^(-1)`
Promotional Banner

Topper's Solved these Questions

  • THERMOCHEMISTRY

    P BAHADUR|Exercise Exercise 2|1 Videos

  • THERMOCHEMISTRY

    P BAHADUR|Exercise Exercise 3|1 Videos

  • THERMOCHEMISTRY

    P BAHADUR|Exercise Hess Law|4 Videos

  • REDOX REACTIONS

    P BAHADUR|Exercise Exercise(8) Statement:Explanation type problems|19 Videos

  • THERMODYNAMICS

    P BAHADUR|Exercise Exercise|232 Videos

Similar Questions

Explore conceptually related problems

In solid ammonia, each NH_(3) molecule has six other NH_(3) molecules as nearest neighbours. DeltaH sublimation of NH_(3) at the melting point is 30.8 k J mol^(-1) , and the estimated DeltaH sublimation in the absence of hydrogen bonding is 14.4 kJ mol^(-1) . the strength of a hydrogen bond is NH_(3) is

Why is the bond angle in PH_(3) molecule lesser than that in NH_(3) molecule?

The bond angle in H_(2)O molecule is less than that of NH_(3) molecule because__________.

The standard enthalpy of formation of NH_(3) is -46.0 kJ mol^(-1) . If the enthalpy of formation of H_(2) from its atoms is -436 kJ mol^(-1) and that of N_(2) is -7112kJ mol^(-1) , the average bond enthalpy of N-H bond in NH_(3) is :-

What is the number of molecules present in 1-5 mole of ammonia (NH_(3)) ?

The standard enthalpy of formation of NH_(3) is -46.0KJ mol^(-1) . If the enthalpy of formation of H_(2) from its atoms is -436KJ mol^(-1) and that of N_(2) is -712KJ mol^(-1) , the average bond enthalpy of N-H bond in NH_(3) is