Chemistry-
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Question

TheenthalpyofformationforC2H4(g),CO2(gand H2O(ella25°and 1atmpressurar52,–39and –286KJmol1 respectivelyThenthalpof combustiooC2Hwill be-

  1. +1412KJmol1    
  2. 1412KJmol1    
  3. +142.2KJmol1    
  4. 141.2KJmol1    

The correct answer is: +1412KJmol1

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