Question

A sol. Of a non volatile solid in 100 g benzene is boiled at 0.42c higher than the boiling point of pure benzene. Calculate the mol. Mass of the substance

Answer 1

The question is incomplete.

However,

Given:

Weight = 100 g

Temperature = +0.42 degree

Weight of the sol = 2.5 g

To find:

The molar mass of the substance.

Solution:

By formula,

Molar mass = 1000 * kb * weight of the sol / weight of benzene * temperature

Where,

kb - Boltzman constant ( 2.67 )

Substituting the values,

We get,

Molecular mass = 1000 * 2.67 * 2.5 / 100 * 0.42

159 g / mol

Hence, The molecular mass of substance is 159 g / mol.