Q.

The mass of a non-volatile solute (molar mass = 40 g mol-1) dissolved in 114 g octane to reduce its vapour pressure to 80% is

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a

32 g

b

10 g

c

16 g

d

3.2 g

answer is B.

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Detailed Solution

PA0−PAPA0=χsolute 20100=nn+1∴ n=14Mass of solute = 10 g
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The mass of a non-volatile solute (molar mass = 40 g mol-1) dissolved in 114 g octane to reduce its vapour pressure to 80% is