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Q.

The polymerization of ethylene to linear polyethene is represented by the reaction nCH2=CH2→--CH2-CH2--n where ‘n’ has large integral value. Given that average enthalpies of bond dissociation for C=C and C-C at 298K are +590 and +331KJ mol−1 respectively. Calculate the enthalpy of polymerization per mole of ethylene at 298K.

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a

−36KJmol−1

b

−72KJmol−1

c

−18KJmol−1

d

−90KJmol−1

answer is B.

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Detailed Solution

ΔHpolymerisation =-2ΔC-cH+ΔC=cH=-2(331)+590=-662+590=-72KJmol-1
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The polymerization of ethylene to linear polyethene is represented by the reaction nCH2=CH2→--CH2-CH2--n where ‘n’ has large integral value. Given that average enthalpies of bond dissociation for C=C and C-C at 298K are +590 and +331KJ mol−1 respectively. Calculate the enthalpy of polymerization per mole of ethylene at 298K.