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:

Options

A. `102KJ`
B. `201KJ`
C. `104KJ`
D. `120KJ`

Answer

B

Explanation

b
`P_(4)(s)toP_(4)(g) /_\H=59KJ`
`P_(4)(s)to4P(g) /_\H=1265KJ`
`P_(4)(g)to 4P(g) /_\H=1206KJ`
Average `P-P` bond enthalpy` =1206/6=20KJ`