Chemistry-
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Question

Ia298K thbonenergieof C–H,CC,C=and Hbondarrespectively 414,347,615and 435KJmol1,thevalueofenthalpy changfotheraction H2C=CH2(g)+H2(g)→CH3CH3(g)at298 K wilbe-

  1. +125KJ [    
  2. 125KJ    
  3. +250KJ    
  4. 250KJ    

The correct answer is: –125KJ

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