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The polymerization of ethylene to linear polyethylene is represented by the reaction \( n \mathrm{CH}_{2}=\mathrm{CH}_{2} \rightarrow\left(-\mathrm{CH}_{2}-\mathrm{CH}_{2}-\right) n \)
where \( n \) has a large integral value. Given that the average enthalpies of bond dissociation for \( \mathrm{C}=\mathrm{C} \) and \( \mathrm{C}-\mathrm{C} \) at \( 298 \mathrm{~K} \) are \( +590 \) and \( +331 \mathrm{~kJ} / \mathrm{mol} \), respectively, the enthalpy of polymerization per mole of ethylene at \( 298 \mathrm{~K} \) is
(a) \( -72 \mathrm{~kJ} \)
(b) \( +259 \mathrm{~kJ} \)
(c) \( -259 \mathrm{~kJ} \)
(d) \( -849 \mathrm{~kJ} \)
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