Question

Calculate the number of molecules in 8 g of oxygen gas.(given atomic mass of O= 16, molar mass = 32)​

Answer 1

Answer:

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

Answer 2

Explanation:

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

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.