Mole Concept

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Since it is not possible to calculate the weight of particles individually, a collection of such particles called mole is taken for all practical purposes. Avogadro discovered that under standard conditions of temperature and pressure, (1atm and 273K) a sample of gas occupies a volume of 22.4 L.

It was discovered that the number of atoms present in 12g of carbon is 6.023 x 10²³ atoms. This is referred to as Avogadro number.

A mole of a gas is the amount of a substance containing 6.023 x 10²³ particles.

Avogadro's number is the number of atoms present in C¹² isotope = 12g of C.

One mole of any gas at STP will have a volume of 22.4 L.