Avogadro's Number Lesson

formula weight and Avogadro number

By SOODULA REDDY

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​Formula weight of a substance is commonly taken as molecular weight. The term formula weight is used for ionic compounds.

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Formula weight (or) Formula mass:

The no. of entities in one mole is called avogadro number.

Its value is 6.023x1023

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Avogadro number (N) :

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​Reciprocal of Avogadro number is known as Avogram

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​ Avogram=1/n=1/6.023x10^23

=1.67​×10^-24

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is a unit of mass equal to one gram divided by the Avogadro's number.

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The no. of molecules present in 1 cc of a gas (or. vapour) at S.T.P is called Loschmidt no.

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The volume occupied by one mole of any gaseous substance at S.T.P is equal to 22.4 litres. volume is known as molar volume (or) Gram molar volume (GM.V).

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Volume (litres) of a gas at S.T.P

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​Weight of the gas in

grams /

Gram molecular weight

x 22.4

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