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Chemistry homework help with Mole Concept

Mole Concept

A mole of any substance is related to :

(a) Mass of a substance

(b) Number of particles

(c) Volume of the gaseous substance

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.

Mole-Weight Relationship

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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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