Q.

The vapour pressure of pure water at 75oC is 296 torr the vapour pressure lowering due to 0.1 m solute is

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a

0.533 torr

b

0.296 torr

c

0.333 torr

d

0.428 torr

answer is A.

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Detailed Solution

ΔP296=0.10.1+100018,where 100018=number of moles  of water ∴ΔP=0.533 torr
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The vapour pressure of pure water at 75oC is 296 torr the vapour pressure lowering due to 0.1 m solute is