Chapter 14, Problem 34E

Interpretation Introduction

Interpretation:

The mass of ethanol that must be added to the ethanol water solution of volume 100 mL to increase the mole fraction of ethanol to 0.0525 needs to be determined.

Concept introduction:

The mole fraction of a solute in solution can be calculated as follows:

${\text{mole fraction}}_A=\frac{\text{number of moles of A}}{\text{number of moles of solution}}$

Also, number of moles is related to mass and molar mass of a substance as follows:

$n=\frac{m}{M}$

Here, m is mass and M is molar mass.

The density of a substance relates its mass and volume as follows:

$d=\frac{m}{V}$

Here, m is mass and V is volume.