A mole of any substance is related to :
(a) Mass of a substance
(b) Number of particles
(c) Volume of the gaseous substance
A mole is a collection of 6.023 × 1023 particles, ions, atoms etc.
i.e. (i) 6.023 × 1023 atoms of Na constitute one mole atom of Na.
(ii) 6.023 × 1023 molecules of oxygen constitute 1 mole of oxygen molecules.
(iii) 6.023 × 1023 electrons constitute one mole of electrons.
One mole of every substance weighs equal to the gram atomic weight of the substance or to the gram molecular weight of the substance.
e.g. (i) 1 mole of sodium weighs 23 g of Na.
(ii) 1 mole of CaCO3 weighs 100 g.
One mole of every gas occupies 22.4 lit. of volume at STP.
i.e. 1 mole of O2 occupies 22400 ml of volume at STP.
1 mole of He occupies 22400 ml of volume at STP.
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