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Vapour pressure of pure water is 40 mm. ...

Vapour pressure of pure water is 40 mm. if a non-volatile solute is added to it, vapour pressure falls by 4 mm. Hence, molality of solution is

A

6.173 molal

B

3.0864 molal

C

1.543 molal

D

0.772 molal

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A
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