Question

The mass of 1 x 10²² molecules of chlorine is (approximately)

(a) 0.3 g

(b) 0.6 g

(c) 1.2 g

(d) 2.4 g

Answer 1

Correct option is (c) 1.2 g

Molar mass of Cl₂ = 71g = 6.02 x 10²³ molecules

Mass of 1 x 10²² molecules = \(\frac{71 \times 10^{22}}{6.02 \times 10^{23}} \approx1.20 g\)