MCQ
The bond energy of $C = C$ and $C -C$ at $298\, K$ are $590$ and $331\, kJ\, mol^{-1}$ respectively. The enthalpy of polymerisation per mole of ethylene is .....$ kJ$
- A$-70$
- ✓$-72$
- C$+72$
- D$-68$
✓
Answer
Correct option: B.
$-72$
b
The polymerisation of ethene has one mole of $C = C$ bond is decomposed and two moles of $C - C$ bonds are formed per mole of ethylene
The polymerisation of ethene has one mole of $C = C$ bond is decomposed and two moles of $C - C$ bonds are formed per mole of ethylene
$\therefore \Delta H =590-2 \times 331=-72 kJ$ per mole of ethylene.
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