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Q.

The dissolution of CaCl2.6H2O in a large volume of water is endothermic to the extent of 3.5 kcal/ mol. For the reaction , CaCl2(s)+6H2O(l)→CaCl2.6H2O(s); ΔH  is −23.2 kcal/mol. The heat of solution of anhydrous CaCl2 in large quantity of water will be

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a

-19.7  k.cal.mol−1

b

26.7  k.cal.mol−1

c

19.7  k.cal.mol−1

d

-26.7  k.cal.mol−1

answer is B.

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Detailed Solution

ΔH dissolution CaCl2=ΔHdissolutionCaCl2.6H2O+ΔHdissolution CaCl2 =(+3.5)+(−23.2)=−19.7 k.cal/mole

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