Chapter 10, Problem 4KSP

Interpretation Introduction

Interpretation:

The mole fraction of ethanol in a given solutionis to be calculated.

Concept introduction:

The mole fraction of an individual gas, for a combination of gases, is the ratio of the moles of the individual gas with the total number of moles of the mixture.

${\chi }_i=\frac{n_i}{n_{\text{total}}}$

Here, ${\chi }_i$ is the mole fraction, $n_i$ is the mole fraction of individual gas, and $n_{\text{total}}$ is the total number of moles.

The number of moles can be calculated as

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

Here, m represents the mass of the molecule, M represents the molar mass of the molecule, and $n$ is the number of moles.

The formula of density can be expressed as

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

Here, $d$ is the density, $m$ is the mass, and $V$ is the volume.