Calculate the number of particles in each of the following

0.1 mole of hydrogen

The number of particles present in one mole of any substance is has a fixed value of 6.022 × 10²³. This number is called Avogadro constant(N_A).

Number of mole of hydrogen = 0.1 mole

Molar mass of H₂ = 2u

Apply the formula given below:

Number of particles = number of moles × 6.022 × 10²³

⇒ Number of particles = 0.1 mole × 6.022 × 10²³

^⇒ Number of particles = 6.022 × 10²⁴

Thus, 0.1 mole of hydrogen contains 6.022 × 10²⁴particles.