Chapter 13, Problem 64A

Interpretation Introduction

Interpretation:

A ideal gas is to be defined and the reason why there is no true ideal gas in nature is to be justified.

Concept introduction:

The concept of ideal gas is studied by kinetic gas theory.

Answer to Problem 64A

A gas is ideal if it follows all the gas laws at all temperature and pressure.

There is no ideal gas in nature because all gases follow ideal gas equation at low temperature and high pressure and deviates from ideal behavior at high temperature and low pressure.

Explanation of Solution

According to kinetic molecular theory, an ideal gas should follow:

• Volume occupied by a molecule should be negligible as compared to total volume of gas.
• There should be no attractive forces between the gas molecules.

So, a gas can behave ideally if above postulates are followed and these can be followed if temperature is high and pressure is low. These conditions will help the gas particles to remain at larger distance with no attractions.

And if the pressure is high and temperature is low then particles come closer and there exist a force of attraction between them.

Because a gas don't follow kinetic theory at all temperature and pressure, it is not ideal in nature.

Conclusion

All gases are real. They show ideal behavior at specific temperature and pressure range.