Using the data provided, calculate the multiple bond energy (`kJ "mol"^(-1)`) of a `C equiv C` bond in `C_(2)H_(2)`.That energy is (take the bond enrgy of a C-H bond as 350 kJ ` "mol"^(-1)`):
`2C(s) + H_(2)(g) to C_(2)H_(2)(g), DeltaH = 225 kJ "mol"^(-1)`
`2C(s) to 2C(g), DeltaH = 1410 kJ "mol"^(-1)`
`H_(2)(g) to 2H(g), DeltaH = 330 kJ "mol"^(-1)`

Options

A. 1165
B. 837
C. 865
D. 815

Answer

D

Explanation

`1410+330-(2xx350)+x=255`
x is heat of formation of C -=C bond