Question

what is mole? how it is calculated by given an example?

Answer 1

A mole is a huge number used to measure atoms. It is equal to the number of atoms in 12 grams of carbon-12, which is approximately 6.022 x 1023 atoms.
For example, if you want to calculate the molar mass of NaCl, or table salt, you add the mass of each element. Each molecule has one Na and one Cl atom. Therefore the mass of one mole of NaCl is the mass of Na plus the mass of Cl:

NaCl = Na + Cl

NaCl = 22.9898 g/L + 35.4530 g/L

NaCl = 58.4538 g/L

Note that the number of atoms in a molecule varies. Each molecule of H20, for example, has two hydrogen atoms and one oxygen atom.

Answer 2

Mole is basically the SI UNIT of the amount of the substance ...
the mole of element or a substance can be calculated by the formula as
Mole= Given Mass / Molar mass....

Mole = Given volume / Molar volume ....

Basically 1 mole = 6.023 × 10^23 Atoms,molecules ,particles,etc