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

Options

A. `-70 kJ`
B. `-72 kJ`
C. `72 kJ`
D. `-68 kJ`

Explanation

To find the enthalpy of polymerization per mole of ethylene, we will use the bond energies provided and apply the concept of bond energy in the context of a polymerization reaction.

### Step-by-Step Solution:

1. **Identify the Reaction**:
In the polymerization of ethylene (C₂H₄), the double bond (C=C) in ethylene converts to single bonds (C-C) in the polymer. The reaction can be represented as:
\[
n \text{ C}_2\text{H}_4 \rightarrow \text{(C-C)}_n
...