Question

What are moles in chemistry?

Answer 1

The mole is the unit of amount in chemistry. ... A mole of a substance is defined as: The mass of substance containing the same number of fundamental units as there are atoms in exactly 12.000 g of 12C. Fundamental units may be atoms, molecules, or formula units, depending on the substance concerned.

Answer 2

moles is definid as a SI unit of amount of substances which contains 6.022×10^23 particles

actually mole concept is useful in chemistry as it allow to calculate bigger numbers very easily

for ex:- 1 mole of oxygen gas has 6.022×10^23 oxygen molecules

here 6.022×10^23 is called avagadro number

also 1 mole of any gases contain 22.4L