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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)`
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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

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Knowledge Check

  • Bond angle in NH_(3) molecule is

    A
    `109^(@) 28^(@)`
    B
    `107^(@) 18^(@)`
    C
    `104^(@) 9^(@)`
    D
    `90^(@)`

  • A molecule of ammonia (NH_(3)) has

    A
    only single bonds
    B
    only double bonds
    C
    only triple bonds
    D
    two double bonds and one single bond.

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

    A
    the hybridisation of `H_(2)O` and `NH_(3)` is different
    B
    the atomic radii of N and O are different
    C
    there is one lone pair of electorns on O and two lone pair of electrons on N
    D
    there are two lone pairs of electrons on O and one lone pair of electrons of N

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