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Calculateenthalpychangeofthefollowingreaction H2C=CH2(g)+H2(g)→H3CCH3(g) ThebondenergiesofC–H,C–C,C=C,H–Hare414, 347,615and435KJmol1respectively-

  1. 125KJmol1    
  2. 125KJmol1    
  3. 250KJmol1    
  4. 25KJmol1    

The correct answer is: –125KJmol1

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