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Chapter 9

The gas laws

Learning objectives

In this chapter you will learn how to:

●use the concepts of the mole, the molar mass and the Avogadro constant

●solve problems using moles, molar masses and the Avogadro constant

●use the concept of pressure

●solve problems using the equation of state of an ideal gas

●understand the assumptions behind the kinetic model of an ideal gas

●understand the connection between average kinetic energy of molecules and the kelvin temperature

●recognise the conditions under which a real gas may be described by the ideal gas law.

GUIDING questions

●How can the macroscopic behaviour of gases be explained in terms of the motion of molecules?

●What is the origin of pressure in a gas?