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Define mole....

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Define mole....

Posted by ?Ritesh Gupta? 3 years, 11 months ago

CBSE > Class 11 > Chemistry

4 answers

Anmol Agarwal 3 years, 11 months ago

The mole is the unit of measurement for amount of substance in the International System of Units

?Ritesh Gupta? 3 years, 11 months ago

Sowndu se

Aadya Singh 3 years, 11 months ago

Nhi meri baat nhi hoti seraj, Smarkakee se

Gaurav Seth 3 years, 11 months ago

Mole Concept

Term mole was suggested by Ostwald (Latin word mole = heap)

A mole is defined as the amount of substance which contains same number of elementary particles (atoms, molecules or ions) as the number of atoms present in 12 g of carbon (C-12).

1 mol = 6.023 * 10²³ atoms = one gram-atom = gram atomic mass

1 mol = 6.023 * 10²³ molecules = gram molecular mass

In gaseous state at STP (T = 273 K, p = 1 atm)

Gram molecular mass = 1 mol

= 22.4 L = 6.022 * 10²³ molecules

Standard number 6.023x 10²³ is called Avogadro number in honour of Avogadro (he did not give this number) and is denoted by N_A.

The volume occupied by one mole molecules of a gaseous substance is called molar volume or gram molecular volume.

Number of moles = amount of substance (in gram) / molar mass

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