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The vapour pressure of acetone at 20^(@)...

The vapour pressure of acetone at `20^(@)C` is 185 torr. When `1.2 g` of non-volatile substance was dissolved in `100g` of acetone at `20^(@)C` its vapour pressure was 183 torr. The moalr mass `(g mol^(-1))` of the substance is:

A

32

B

64

C

128

D

488

Text Solution

Verified by Experts

The correct Answer is:
B
`(P_(@)-P_(S))/(P_(S))=(n)/(N)`
`(185-183)/(183)=(1.2//M)/(100//58)rArr M ~~ 64 g//mol`
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The vapor pressure of acetone at 20^(@)C is 185 torr. When 1.2 g of a non-volatile solute was dissolved in 100 g of acetone at 20^(@)C , it vapour pressure was 183 torr. The molor mass (g mol^(-1)) of solute is:

The vapour pressure of water at 20^(@)C is 17.54mm . When 20g of non - ionic substance is dissolved in 100g of water, the vapour pressure is lowered by 0.30mm . What is the molecular mass of the substance ?

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