Question

How many atoms are in $1$ mole of a substance?

Answer 1

Number of atoms present in one mole are:

Step 1: One mole of substance comprises $6.022\times {10}^{23}$atoms or molecules of that substance.

Step 2: The number $6.022\times {10}^{23}\mathrm{atoms}$ is called Avogadro's number.

Thus, there are $6.022\times {10}^{23}\mathrm{atoms}$ (Avogadro's number) in one mole.