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Q.

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

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a

6.3 x 10-4

b

3.5 x 10-3

c

5 x 10-3

d

None of these

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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