First slide

Theory of dilute solutions

Question

20 g of napthoic acid $(C_{11} H_{8} O_{2})$ . Dissolves in 50 g of benzene $(K_{f} = 1 .72 K kg {mol}^{- 1})$ shows a depression in freezing point of 2K. The Van’t Hoff factor is

Moderate

Solution

Molar mass = $12 \times 11 + 8 + 32 = 132 + 40 = 172$
${ΔT}_{f} = i K_{f} m$
$2 = i (1 .72) \frac{(20) (1000)}{(172) (50)}$
$2 = i (4)$
$i = 0 .50$

Get Instant Solutions

When in doubt download our app. Now available Google Play Store- Doubts App

Recieve an sms with download link

Doubts App

OR

SCAN ME

Doubts App

Doubts App