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Calculate heat of formation of isoprene ...

Calculate heat of formation of isoprene using bond energy data.
`5C(s) + 4H_(2)(g) rarr H_(2)C = underset(CH_3)(|)(C ) - HC =CH_(2)`
Given `C - H = 98.8 kcal`
`H - H = 104 kcal`
C – C= 83 kcal
C = C = 147 kcal and `C(s) rarr C(g) = 171 kcal`

A

`-21 kcal`

B

`21 kcal`

C

`40 kcal`

D

`50 kcal`

Text Solution

Verified by Experts

The correct Answer is:
B
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