Question

How to determine mole fraction of solvent when moles of solute and solvent are given?

• A. $\frac{\text{Moles of solute}}{\text{Moles of solvent}}$
• B. $\frac{\text{Moles of solute}}{\text{Moles of solution}}$
• C. $\frac{\text{Moles of solute}}{\text{Moles of solute+ Moles of solvent}}$
• D. $\frac{\text{Moles of solvent}}{\text{Moles of solute+Moles of solvent}}$

Answer 1

The correct option is D

$\frac{\text{Moles of solvent}}{\text{Moles of solute+Moles of solvent}}$

Mole fraction (X) is just the ratio of the number of moles of the required quantity to the sum of number of moles of all other quantities. We usually only have a solute and a solvent.

$\therefore X_{solvent}=\frac{Molesofsolvent}{\text{Moles of solute + Moles of solvent}}$