The dissolution of $C a C l_{2} .6 H_{2} O$ in a large volume of water is endothermic to the extent of 3.5 kcal/ mol. For the reaction , $C a C l_{2} (s) + 6 H_{2} O (l) \to C a C l_{2} .6 H_{2} O (s); Δ H i s - 23.2 k c a l / m o l .$ The heat of solution of anhydrous $C a C l_{2}$ in large quantity of water will be

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-19.7 $k . c a l . m o l^{- 1}$

26.7 $k . c a l . m o l^{- 1}$

19.7 $k . c a l . m o l^{- 1}$

-26.7 $k . c a l . m o l^{- 1}$

answer is B.

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Detailed Solution

$Δ H_{d i s s o l u t i o n} C a C l_{2} = Δ H_{d i s s o l u t i o n} C a C l_{2} .6 H_{2} O + Δ H_{d i s s o l u t i o n} C a C l_{2} = (+ 3.5) + (- 23.2) = - 19.7 k . c a l / m o l e$

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