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Q.

A very dilute saturated solution of a sparingly soluble salt X3Y4 has a vapour pressure of 20 mm Hg at temperature TK while pure water exerts a pressure of 20.0126 mm Hg at the same temperature. Calculate molality (m) at temperature TK:

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a

5 x 10-3

b

5 x 10-4

c

6.3 x 10-4

d

3.5 x 10-3

answer is C.

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Detailed Solution

m=P∘−PP×1000Msolvent 7m=(20.0126−20)×100020×18m=5×10−3

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