Chapter 5.7, Problem 17PE

Interpretation Introduction

Interpretation:

The molar mass of the unknown gas has to be calculated.

Concept Introduction:

The rate of effusion is the number of molecules passing through a porous barrier in a given time.  The longer it takes, the slower the rate of effusion.

Using given Equation we find the molar mass of unknown gas

  $\frac{{\text{r}}_{\text{1}}}{{\text{r}}_{\text{2}}}\text{=}\frac{{\text{t}}_{\text{1}}}{{\text{t}}_{\text{2}}}\sqrt{\frac{{\text{M}}_{\text{2}}}{{\text{M}}_{\text{1}}}}$