Calculate the number of particles in each of the following

8g of O₂

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).

Mass of O₂ = 8g

Molar mass of O₂ = 32u

Apply the formula given below:

Number of particles = number of moles × 6.022 × 10²³

⇒

⇒

⇒ Number of particles = 0.25 × 6.022 × 10²³

^⇒ Number of particles = 1.5 × 10²³

Thus, 8g of O₂ contains 1.5 × 10²³ particles.