Some Basic Concepts of Chemistry

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Mole is defined as the amount of a substance, which contains the same number of chemical units (atoms, molecules, ions or electrons) as there are atoms in exactly 12 grams of pure carbon-12.

A mole represents a collection of 6.022 x10²³( Avogadro's number) chemical units. The mass of one mole of a substance in grams is called its molar mass.

Molar Volume: The volume occupied by one mole of any substance is called its molar volume. It is denoted by Vm. One mole of all gaseous substances at 273 K and 1 atm pressure occupies a volume equal to 22.4 litres or 22,400 mL. The unit of molar volume is litre per mol or millilitre per mol.