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The polymerization of styrene to polystyrene is represented by the reaction

Where n has a large integral value. Given that average enthalpies of bond dissociation for C = C and C – C at 298 K are +145 Kcal/mol and +80K cal/mol respectively, calculate the heat released during polymerization per mole of styrene at 298K (in Kcal)

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answer is 15.

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Detailed Solution

$C = C \to - [C - C] -$

Per molecule 1 C = C breaks and two C – C bonds are formed
$Δ H = + 145 - 2 \times 80$
= - 15 Kcal/mole
Heat released = 15 Kcal/mole

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