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Enthalpy of solution of $M C l_{2} (s)$ is -108kJ/mole. Enthalpy of solution of $M C l_{2} .6 H_{2} O (s)$ is -81 kJ/mole. Enthalpy of hydration of $M C l_{2} (s)$ into its hexahydrate is

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+190 kJ

+ 27 kJ

-190 kJ

-27 kJ

answer is D.

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Detailed Solution

$M C l_{2} (s) + a q \to M C l_{2} (a q), Δ H = - 108 k J ... (1)$

$\begin{array}{l} M C l_{2} .6 H_{2} O (s) + a q \to M C l_{2} (a q), Δ H = - 81 k J ... (2) \\ E q (1) - E q (2) \\ M C l_{2} (s) \to M C l_{2} .6 H_{2} O (s) . Δ H = - 27 k J \end{array}$

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