First slide

Theory of dilute solutions

Question

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

Moderate

A

14.97
B

149.7
C

1697
D

1.497

Solution

${πV}_{2} = \frac{W_{2}}{{Mw}_{2}} RT \frac{500}{76} \times \frac{100}{1000} = \frac{4}{{Mw}_{2}} \times 0.0821 \times 300 ∴ {Mw}_{2} = 149.6$

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