Chemistry-
General
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Question

Fromthefollowingdata,theheatofformationof Ca(OH)2(s) at18°Cis......Kcal.
i)CaO(s)+HO(ell)=Ca(OH)(s);ΔH18°C=–15.26Kcal....
ii)H2O(ell)=H2(g)+1/2O2(gH18°C=68.37Kcal......
iii)Ca(s)+1/2O2(g)=CaO(s)ΔH18°C=–151.80Kcal...

  1. 98.69    
  2. 235.43    
  3. 194.91    
  4. 98.69    

The correct answer is: –235.43

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