Chapter 8, Problem 34QRT

Interpretation Introduction

Interpretation:

Molar mass of unknown gas sample has to be determined using the given data.

Concept Introduction:

Molar mass:

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

Where,

n is number of moles

m is mass

M is molar mass.

Ideal gas Equation:

Any gas is described by using four terms namely pressure, volume, temperature and the amount of gas. Thus combining three laws namely Boyle’s, Charles’s Law and Avogadro’s Hypothesis the following equation could be obtained. It is referred as ideal gas equation.

  $\begin{array}{l}\text{V }\propto \frac{\text{nT}}{\text{P}}\\ \text{V = R}\frac{\text{nT}}{\text{P}}\\ \text{PV = nRT}\end{array}$

Where,

n is number of moles

P is pressure

T is temperature

R is gas constant

Total pressure of a mixture of gases in tube is the sum of partial pressure of gas that has being collected and the partial pressure of water.  Partial pressure of water in gaseous mixture is vapor pressure of water.