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(CHEM) Which of the following compounds can exist as cis and trans isomers ?

  1. Oct 4, 2009 #1
    Using average bond enthalpy values estimate ΔH (kJ/mol) for the following gas phase r

    Using average bond enthalpy values estimate ΔH (kJ/mol) for the following gas phase reaction.

    CH2=CH2 + Br2 --> CH2BrCH2Br

    I followed this topic: http://answers.yahoo.com/question/index?qid=20080306194402AAtIc63
    and I got the wrong answer.

    I came up with 129 which is wrong.

    Here is my work :
    C-H = 4x416 = 1664
    C=C = 1x598 = 598
    Br-Br = 2x193 = 386

    1664+598+386 = 2648




    C-H = 4x416 = 1664
    c-Br = 3x285 = 855

    1664+2519 = 2519

    2648-2519 = 129 (which is wrong.) Please Help Me! Thank you!
     
    Last edited: Oct 4, 2009
  2. jcsd
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