what is mole in chemistry class 11

In chemistry, a mole is defined as the amount of a substance that contains exactly 6.02214076 x 10^23 'elementary entities' of the given substance, such as atoms, ions, or molecules. It is a standard scientific unit used to measure large quantities of very small entities. For example, 12 grams of carbon-12 isotope contains 6.022140857 x 10^23 carbon atoms, which is equal to one mole of carbon. The number 6.022140857 x 10^23 is known as Avogadro’s number. Therefore, one mole of any substance contains the same number of entities, irrespective of their molecular weight or nature