Q.

A solution containing 4 g of a non-volatile organic solute per 100 mL was found to have an osmotic pressure equal to 500 cm of mercury at 27°C. The molecular weight of solute is

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a

14.97

b

149.7

c

1697

d

1.497

answer is B.

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Detailed Solution

πV2=W2Mw2RT 50076×1001000=4Mw2×0.0821×300 ∴ Mw2=149.6
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A solution containing 4 g of a non-volatile organic solute per 100 mL was found to have an osmotic pressure equal to 500 cm of mercury at 27°C. The molecular weight of solute is