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The polymerisation of propene to linear polypropene is represented by the reactionwhere n has large integral value, the average enthalpies of bond dissociation for (C = C) and (C-C) at 298K are +590 and +331 kJ mol-1, respectively. The enthalpy of polymerisation is -360 kJ mol-1. Find the value of n.

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answer is 5.

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Detailed Solution

Energy released - Energy due to formation of two single bonds=2×331=662 kJ mol−1 of propene ΔH changes due to addition per mole=590−662=−72kJmol−1ΔH polymerisation =−72×n=−360n = 5

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The polymerisation of propene to linear polypropene is represented by the reactionwhere n has large integral value, the average enthalpies of bond dissociation for (C = C) and (C-C) at 298K are +590 and +331 kJ mol-1, respectively. The enthalpy of polymerisation is -360 kJ mol-1. Find the value of n.