Benzoic acid undergoes dimerization in benzen | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(A) For dimerization of benzoic acid: $2C_6H_5COOH \rightleftharpoons (C_6H_5COOH)_2$ Van't Hoff factor $(i) = 1 - \alpha + \frac{\alpha}{n}$ Given $\

Vedclass · Accepted Answer

$2.44$

Vedclass · Answer

(A) For dimerization of benzoic acid: $2C_6H_5COOH \rightleftharpoons (C_6H_5COOH)_2$ Van't Hoff factor $(i) = 1 - \alpha + \frac{\alpha}{n}$ Given $\alpha = 88 \% = 0.88$ and $n = 2$ $i = 1 - 0.88 + \frac{0.88}{2} = 1 - 0.88 + 0.44 = 0.56$ We know,$\Delta T_f = i \cdot K_f \cdot m$ $\Delta T_f = i \cdot K_f \cdot \frac{w_2 \cdot 1000}{M_2 \cdot w_1}$ $1.12 = 0.56 \cdot 4.9 \cdot \frac{x \cdot 1000}{122 \cdot 49}$ $1.12 = 0.56 \cdot 0.1 \cdot \frac{1000x}{122}$ $1.12 = \frac{56x}{122}$ $x = \frac{1.12 \cdot 122}{56} = 2.44 \ g$

Similar Questions

For an aqueous solution of $FeSO_4$, the experimental molecular mass is found to be $80 \ g/mol$. What is the degree of dissociation of the salt?

When benzoic acid dissolves in benzene,the observed molecular mass is

The van't Hoff factor $i$ for a compound which undergoes dissociation in one solvent and association in another solvent is respectively:

The molecular weight of benzoic acid in benzene as determined by the depression in freezing point method corresponds to:

Vedclass Test Series

Exam Paper Generator

Online Exam Module