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White phosphorus is a tetra atomic solid...

White phosphorus is a tetra atomic solid `[P_(4)(s)]` at room temperature and on strong heating in absence of oxyge, it polymerizes into red phosphorus as:
`/_\H=-104kJ//"mol"` of `P_(4)`
The enthalpy of sublimation `[P_(4)(s)toP_(4)(g)]` white is `59KJ//"mol"` and enthalpy of atomization is `1265 KJ//"mol"` of `P(g)`
The average `P-P` bond enthalpy in `P_(4)` molecule is:

A

`201KJ`

B

`104KJ`

C

`305KJ`

D

`80KJ`

Text Solution

Verified by Experts

The correct Answer is:
C
c
On an average one `P-P` bond of tetrahedral is broken and one new `P-P` bond joining the two tetrahedral units is formed.
`201-x=-104`
`:.x=305KJ"mol"^(-1)`
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