Question

If 1g SO2 gas contains x molecules than calculate the number of molecules present in 1g of oxygen gas?

Answer 1

Hi,

The number of molecules in 1 g of oxygen gas is given below :

Molar mass of oxygen is 16 g

Molecular mass of O₂ = (16 +16) g per mole.

⇒ Molecular mass of O₂ = 32 g per mole.

Which means mass 1 mole of di oxygen is equal to 32 g

As 1 mole contains 6.022 × 10²³ particles.

Therefore, 32 g contains → 6.022 × 10²³ molecules of di oxygen.

1 g contains → 6.022 × 10²³ / 32 molecules of di oxygen.

⇒ 1 g contains → 0.188 × 10²³ molecules of di oxygen.

64 g of SO₂ contain = 6.022 × 10²³ molecules
1 g of SO₂ contain = 6.022 × 10²³/ 64 molecules = 0.09409 × 10²³ molecules

Regards