Question

E2. This solution is formed by adding 6.1 g of benzoic acid to 500 g of benzene at a temperature of -0.290 C. Find the percentage of setup? [K = 5.52 ° K kg mol - l for water]​

Answer 1

Answer:

Freezing point depression is a colligative property observed in solutions that result from the introduction of solute molecules to a solvent. The freezing point of solutions are all lower than that of the pure solvent and is directly proportional to the molality of the solute.

Explanation:

x represents the degree of association of the solute, then we would have (1–x) mol of benzoic acid left in unassociated form and correspondingly 2x as associated moles of benzoic acid at equilibrium. Therefore, total number of moles of particles at equilibrium is

1−x+

2

x

=1−

2

x

=i

x=2(1−i)

⟹x=2(1−0.504)

⟹x=0.992

Percentage association is 99.2%.