Calculate the heat of the reaction CH₂=CH₂(g) + H₂(g) → CH₃–CH₃(g), given that bond energy of C–C, C=C, C–H and H–H is 80, 145, 98 and 103 kcal.
- A−28 kcal mol⁻¹
- B−5.6 kcal mol⁻¹
- C−2.8 kcal mol⁻¹
- D−56 kcal mol⁻¹
✓ Correct answer: A
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