1.

the heat of atomosaton pf P_(4)H_(4)(g)and PH_(3) (g) are 355kcal / mol and 228 kcal/ mol respectively . The energy of P----P bond is

Answer»

`102 KCAL mol ^(-1)`
`51kcal mol ^(-1)`
`26 kcal mol ^(-1)`
`204 kcal mol ^(-1)`

SOLUTION :P ----- H bood energy `=228/3=76 kcal mol^(-1) for P_(4)H_(4)`
bond energy fo `4(P----H)+(P-----P)`
` 355 kcal mol^(-1)``4xx 76 + (P--P)=355 kcal mol^(-1)`
(P---P) bond energy = `51 kcal mol^(-1)`


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