Chapter 11, Problem 11.69QP

Interpretation Introduction

Interpretation:

The approximate partial pressure of ${\text{N}}_{\text{2}}{\text{ and O}}_{\text{2}}$ has to be calculated.

Concept Introduction:

A mole fraction is the unit less proportion of the number of moles of a mixture constituent and the total number of moles in the mixture.

` ${\text{χ}}_{\text{i}}\text{=}\frac{{\text{P}}_{\text{i}}}{{\text{P}}_{\text{total}}}$

The number of molecules of ${\text{N}}_{\text{2}}{\text{, O}}_{\text{2}}\text{, and Ar}$ are known. Since the mole fraction is:

$\frac{{\text{n}}_{\text{i}}}{{\text{n}}_{\text{total}}}\text{=}\frac{\frac{\text{molecules}\text{of}\text{i}}{\text{6}\text{.022×}\text{10}{}^{\text{23}}\text{molecules/mol}}}{\frac{\text{molecules}\text{total}}{\text{6}\text{.022×}\text{10}{}^{\text{23}}\text{molecules/mol}}}\text{=}\frac{\text{molecules}\text{of}\text{i}}{\text{molecules}\text{total}}$