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Thenthalpchanga298K isuccessive breakinof O–H bondowater are H2O→H(g)+OH(g);ΔH=498KJmol1 OH(g)→H(g)+O(g);ΔH=428KJmol1 thbond enthalpof O–H bond is-

  1. 498KJmol1    
  2. Y Kcal.mol    
  3. fraction numerator X 1 over denominator 4 end fraction Kcal.mol    
  4. X1Kcal.mol    

The correct answer is: fraction numerator X 1 over denominator 4 end fraction Kcal.mol

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