First slide

Theory of dilute solutions

Question

12.2 g of benzoic acid (Mw = 122) in 100 g benzene has depression in freezing point 2.6 $°$ ; K_f= 5.2 $°$ kg mol^-1. If there is 100% polymerzation, the number of molecules of benzoic acid in associated state is

Moderate

A

1
B

2
C

3
D

4

Solution

m (benzonic acid)
$= \frac{1000 K_{b} W_{1}}{∆ T_{b} W_{2}} = 244 (t w i c e o f a c t u a l m o l e c u l a r w e i g h t)$

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