Question

Which of the following contains maximum number of molecules?

विकल्प

• 4g of O₂

• 4g of NH₃

• 4g of CO₂ 

• 4 g of SO₂

Answer 1

4g of NH₃

Explanation:

Molecular mass of O₂ = (2 x 16) = 32 g

Molecular mass of NH₃ = 14 + (3 x 1) = 17 g (least weight)

Molecular mass of CO₂ = 12 + (2 x 16) = 44 g

 Molecular mass of SO₂ = 32 + (2 x 16) = 64 g

∴ 4 g of NH₃ contains = `(6.02 xx 10^23)/17 xx 4`

= 1.41 x 10²³

∴ 4 g of NH₃ having minimum molecular mass contain maximum molecules.