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In C(2)H(4) energies of formation of (C=...

In `C_(2)H_(4)` energies of formation of `(C=C) and (C-C)` are -145 kJ/mol and -80kJ/mol respectively. What is the enthalpy change w hen ethylene polymerises to form polythene?

A

`+650" kJ/mole"`

B

`1.5 " kJ/mole"`

C

`-650 " kJ/mole"`

D

`-65" kJ/mole"`

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The correct Answer is:
B
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