Mole Concepts (4)

The molar mass of argon, Ar if the relative atomic mass of argon, Ar is 40

The molar mass of argon is 40 g mol–1

Uses of molar mass

The molar mass is used as the conversion factor between the number of moles and the mass of substance

The formula and the relationship between the number of moles and the mass of substance by using molar mass as the conversion factor

Examples of the conversion between the number of moles and the mass of the particles using molar mass (1)

Examples of the conversion between the number of moles and the mass of the particles using molar mass (2)

Examples of the conversion between the number of moles and the mass of the particles using molar mass (3)

Reason which measuring the volume of a gas is easier compared to measuring its mass

Because gas is very light

The volume of 1 mol of any gas

Has similar value under the same conditions of temperature and pressure

Molar volume

Is the volume occupied by 1 mol of a gas

The molar volume of any gas

Depends on the condition, that is 22.4 dm3 mol–1 at STP or 24 dm3 mol–1 at room conditions