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Explain mole concept with example?
Mole is defined as the amount of a substance, which contains the same number of chemical units (atoms, molecules, ions or electrons) as there are atoms in exactly 12 grams of pure carbon-12. A mole represents a collection of 6.023 x 1023 ( Avogadro's number) chemical units. Thus a mole represents the quantity of material, which contains one Avogadro's number of chemical units of any substance. The unit of mole is denoted as 'mol'.
Example 1:-One mole of hydrogen atoms = 6.023 x 1023 atoms of hydrogen
 Example 2:- One mole of oxygen gas (O2) occupies a volume of 22.4 L at standard temperature and pressure (STP; 0°C and 1 atm), has a mass of 31.998 grams, and contains about 6.022 × 1023 molecules of oxygen. Measuring one of these quantities allows the calculation of the others and this is frequently done in stoichiometry.


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