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The enthalpy change for threaction H2(g)+C2H4(g)→C2H6(g)is........Thbond energies are,H–H=103,C–H=99,C–C=80&C=C=145Kcalmol1

  1. 10Kcalmol1    
  2. +10Kcalmol1    
  3. 30Kcalmol1    
  4. +30Kcalmol1    

The correct answer is: –30Kcalmol1

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