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Enthalpy of Solution

One mole of a...

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One mole of anhydrous salt AB dissolves inwater and liberates 15 J mol-1 of heat. The value ofdrs fon of AB is -20.5 J mol-1. Hence, the enthalpyof dissolution of hydrated salt AB.3H20(s) isAHO

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Q. One mole of anhydrous salt AB dissolves in water and librates

21.0 J {m o l}^{- 1}

of heat. The value of

Δ_{H y d r a t i o n}

- 29.4 J {m o l}^{- 1}

. The heat of dissolution of hydrated salt

A B .2 H_{2} O_{(s)}

Q. One mole of anhydrous

M g C l_{2}

dissolve in water and liberates

25

cal/mol of heat.

Δ H_{h y d r a t i o n}

M g C l_{2} = - 30

cal/mol. Heat of dissolution of

M g C l_{2} \cdot H_{2} O

Q. One mole of anhydrous

M g {C l}_{2}

dissolves in water and liberates

25 cal/mol

Δ H_{h y d r a t i o n}

M g {C l}_{2} = - 30 cal/mol

. Heat of dissolution of

M g {C l}_{2} . H_{2} O

2.46 g

of a hydrated salt

(M S O_{4} x H_{2} O)

is completely dehydrated,

1.20 g

of anhydrous salt is obtained. If the molecular weight of anhydrous salt is

120 g

{m o l}^{- 1}

, what is the value of

x

?

Q. One mole of soda ash dissolves in water with evolution of 25 kJ of heat. Dissolution of 1 mol of the hydrate crystals in water resulted in the absorption of 67 kJ of heat. The heat released due to hydration of soda ash is

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