Question

The sum of mole fractions of solute and solvent of a solution is __________

Answer 1

Always the sum of the mole fraction of solute and solvent of a solution is equal to 1.

Answer 2

Given: A solution.

To find: We have to find the mole fractions of solute and solvent of a solution.

Solution:

A solution is made with a solute and a solvent.

Let a solution be formed by dissolving n moles of solute in m mole of solvent.

Thus, the mole fraction of solute is

$\frac{n}{n + m}$

The mole fraction of solvent is-

$\frac{m}{n + m}$

The total mole fraction is as follows-

$\frac{n}{n + m} + \frac{m}{n + m} \\ \frac{n + m}{n + m} \\ = 1$

The total mole fraction is one.

The sum of mole fractions of solute and solvent of a solution is 1.