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

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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!
 
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