Calculate the mass of 1 molecule of oxygen gas. [ Atomic mas of O = 16 u, NA = 6.022 × 1023 −1 ]

Question

Calculate the mass of 1 molecule of oxygen gas. [ Atomic mas of O = 16 u, NA = 6.022 × 10²³ mol⁻¹ ]

Answer 1

Weight of 1 mole of oxygen molecules = 32_g of oxygen 

Number of atoms in 1 mole of oxygen = 6.022 × 10²³ molecules 

Because 6.022 × 10²³ molecules of O₂ weigh 32 g 

Therefore, 1 molecule of O₂ will weigh = 32/ 6.022×10²³ = 5.313 × 10⁻²³ g