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Mole Concept & Avogadro Number

19. Enthalpy ...

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19. Enthalpy of solution for MgSO4(s) and MgSO47H2O (s) are -20.3kcal and 4.8kcal. Calculate hydration enthalpy of MgSO4

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B e S O_{4}

M g S O_{4}

are insoluble in water. Reason:

B e^{2 +}

M g^{2 +}

have low hydration enthalpies.

25^{\circ} C

M g S O_{4}

was dissolved in water, the heat evolved was found to be

91.2 kJ

M g S O_{4} .7 H_{2} O

on dissolution gives a solution of the same composition accompanied by an absorption of

13.8 kJ

. The enthalpy of hydration, i.e.,

Δ H

for the reaction

M g S O_{4} (s) + 7 H_{2} O (l) \to M g S O_{4} .7 H_{2} O (s)

Q. The enthalpy of solution of anhydrous

C u S O_{4}

- 16

kcal and that of

C u S O_{4} .5 H_{2} O

is 3 kcal.. Calculate the enthalpy of hydration of

C u S O_{4}

Q. The enthalpy change of solution of

B a C l_{2} \cdot 2 H_{2} O

B a C l_{2}

8.8

- 20.6

kJ/mol respectively. Calculator enthalpy change of hydration of

B a C l_{2}

B a C l_{2} \cdot 2 H_{2} O

25^{\circ} C,

1

M g S O_{4}

was dissolved in water, the heat evolved was found to be

91.2 kJ

M g S O_{4} .7 H_{2} O

on dissolution gives a solution of the same composition accompanied by an absorption of

13.8 kJ

. The enthalpy of hydration, i,e.,

Δ H

for the reaction,

M g S O_{4} (s) + 7 H_{2} O (l) \to M g S O_{4} .7 H_{2} O (s)

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