Q.

Lowering of vapour pressure of an aqueous solution of a non-volatile, non-electrolyte 1 M aqueous solution at 100oC is

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14.12 torr

312 torr

13.45 torr

352 torr

answer is C.

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Detailed Solution

1 M aqueous solution contains 1 mole of solute in 1000 g (55.5 moles) of water. xB=11+55.5=156.5 po=760 torr at 100oC ∆ppo=xB,∆p=poxB=760×156.5=13.45 torr

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