Chapter 11, Problem 15PS

Interpretation Introduction

Interpretation: The approximate gas pressure of ether at ${30}^{o}C$ should be determined. The additional ether is whether evaporated or condensed when placed in an ice bath should be determined

Concept Introduction: Vapor pressure is nothing but the pressure of a vapor in contact with its liquid or solid form.

When a liquid and vapor are in equilibrium the pressure exerted by the vapor is called the equilibrium vapor pressure.

The ideal gas equation is,

  $\begin{array}{l}\text{PV}\text{=}\text{nRT}\\ \\ \text{where,}\\ \text{P}\text{=}\text{Pressure}\\ \text{V}\text{=}\text{Volume}\\ \text{n}\text{=}\text{Number of moles}\\ \text{R}\text{=}\text{Gas}\text{constant}\\ \text{T}\text{=}\text{Temperature}\end{array}$

 From its given mass is,

 $\text{Number of moles}\text{=}\frac{\text{Given}\text{mass}}{\text{Molecular}\text{mass}}$