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If a 298K the bond energies of C-H,C-C,C...

If a `298K` the bond energies of `C-H,C-C,C=C` and `H-H` bonds are respectivly `414, 347, 615KJmol^(-1)` , the vlaue of enthalpy change for the reaction
`H_(2)C=CH_(2)(g)+H_(2)(g)+H_(2)(g)rarrH_(3)C-CH_(3)(g)` at `298K` will be

A

`+125 kJ`

B

`-125 kJ`

C

`+250 kJ`

D

`-250 kJ`

Text Solution

Verified by Experts

The correct Answer is:
B

`(615+ 1656 +435)-(347+2484)`
`=2706 -2831=-125 kJ`
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