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Question

The polymerisation of propene to linear polypropene is represented by the reaction
where n ahs large integral value, the average enthalpies of bond dissociation for (C==C) and (CC) at 298k are +590 and +331kJmol1, respectively. The enthalpy of polymerisation is 360kJmol1. Find the value of n.
254104.bmp

A
n=5
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B
n=2
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C
n=7
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D
None of these
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Solution

The correct option is A n=5
n(CH2=CH2)(CH2CH2)n
in polymerisation we can see that one double bond breaks and two single bond forms so enthalpy of polymerisation per mole =5902×331
=72kJ/mol
here, as enthalpy of polymerisation is 360kJ
so value of n =360/72
=5

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