First slide

Theory of dilute solutions

Question

0.6 g of a solute is dissolved in 0.1 L of a solvent which develops an osmotic pressure of 1.23 atm at 27 $°$ C. The molecular weight of the solute is nearly

Moderate

A

149.5 g mol^-1
B

120.0 g mol^-1
C

430.0 g mol^-1
D

None of these

Solution

$π = CRT \Rightarrow 1.23 = \frac{0.6 / {Mw}_{B}}{0.1} \times 0.0821 \times 300 \Rightarrow {Mw}_{B} = 120.15 g {mol}^{- 1}$

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