Question

A solution is prepared by mixing 250 ml toluene (C₇H₈) and 8.4 g thiophene (C₄H₄S). Then molality of thiophene in the solution is ______. [Given : Density of toluene = 0.8 g/ml, Density of thiophene = 1.2 g/ml]
[Multiply your answer by 10]

विकल्प

• 2

• 8

• 5

• 0

Answer 1

A solution is prepared by mixing 250 ml toluene (C 7H 8) and 8.4 g thiophene (C4H 4S). Then molality of thiophene in the solution is 5.

Explanation:

m = `(8.4/84)/(250 xx 0.5) xx 1000`

m `= 8.4/84 xx 4/0.8`

m = 0.5 × 10  ...[Given]

m = 5