Chapter U3.16, Problem 1TAI

Interpretation Introduction

Interpretation :

The method by which chemists keep track of number of gas particles must be explained.

Concept Introduction :

1 mol of any gas contains Avogadro’s number of molecules which is $\text{6}\text{.023}\times {\text{10}}^{\text{23}}$ .

Answer to Problem 1TAI

Chemists keep track of number of gas particles by calculating mass and moles of the gas.

Explanation of Solution

Volume of gas may change with pressure and temperature which can be seen from the ideal gas equation as follows:

  $\text{PV=nRT}$

Here P,V n, R and T are pressure, volume, moles, universal gas constant and absolute temperature respectively.

Number of gas particles can be counted in a sample from the moles of the gas.

For example, if a sample of CO₂ is 22 g, then it is 0.5 mol which will contain $\text{0}\text{.5}\times \text{6}\text{.023}\times {\text{10}}^{\text{23}}=3.0115\times {\text{10}}^{\text{23}}$ molecules of CO₂.