The number of particles in one mole of a substance is: molecular weight
molecular number
Avogadro's weight
Avogadro's number

Avogadro's number

Explanation:

Avogadro number:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

It means 1 mole of any substance contain 6.022 × 10²³ number of representative particles.

For example,

18 g of water = 1 mole = 6.022 × 10²³ molecules of water

35.45 g Cl⁻ = 1mole =  6.022 × 10²³  Cl⁻ ions

1.008 g of hydrogen = 1 mole = 6.022 × 10²³ atoms of hydrogen