1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Enthalpy of polymerization

  1. Oct 16, 2012 #1


    User Avatar
    Gold Member

    1. The problem statement, all variables and given/known data
    The polymerization of ethylene to linear polyethylene is represented by the following reaction
    [itex]nCH_{2}=CH_{2} \rightarrow (-CH_{2}-CH_{2}-)_{n}[/itex]
    where n=large integer value
    Calculate the enthalpy of polymerization per mol of ethylene at 298K if average bond enthalpies of bond dissociation for C=C and C-C are 590 and 331kJ/mol respectively

    2. Relevant equations

    3. The attempt at a solution

    For one mole
    [itex]ΔH_{poly} = BDE of C=C+4\times BDE C-H - BDE of C-C - 4\times BDE C-H[/itex]

    But this is not correct.
  2. jcsd
  3. Oct 17, 2012 #2


    User Avatar

    Staff: Mentor

    Please elaborate on the meaning of your symbols.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook