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The heat of atomisation of PH(3(g)) is 2...

The heat of atomisation of `PH_(3(g))` is `228kcal mol^(-1)` and that of `P_(2)H_(4)` is `355kcal mol^(-1)`. Calculate the average bond energy of `P-P` bond.

A

102

B

51

C

26

D

204

Text Solution

Verified by Experts

The correct Answer is:
B
`PH_(3) rarr P+3H,DeltaH=228`
`H_(2)P-PH_(2) rarr 2P+4H,DeltaH=355`
`e_(P-P)+4xxe_(P-H)=355`
`e_(P-P)+4xx(228)/(3)=355`
`:. e_(P-P)=51`
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