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The bond energies of C=C and C-C at 298 ...

The bond energies of `C=C` and `C-C` at `298 K` are `590` and `331 kJ mol^(-1)`, respectively. The enthalpy of polymerisation per mole of ethaylene is

A

`-70kJ`

B

`-72kJ`

C

`72kJ`

D

`-68kJ`

Text Solution

Verified by Experts

The correct Answer is:
B
The polymeridation of ethene may be represented as
`nCH_(2)=CH_(2)to[-CH_(2)-CH_(2)-]_(n)`
One mole of C=C bond is decomposed and two moles of C-C bonds are formed per mole of ethane
`thereforeDeltaH=590-2xx331=-72kJ` per mol of ethylene.
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