A mole of any substance is related to :
(a) Mass of a substance
(b) Number of particles
(c) Volume of the gaseous substance
1.2.1 Mole-Particle Relationship
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.
1.2.2 Mole-Weight Relationship
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.
1.2.3 Mole-Volume Relationship
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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