Question

Which of the following weighs the least?

(a) 24 g of Mg

(b) 0.9 moles of nitric oxide

(c) 22.4 litres of N₂ at N.T.P.

(d) 6.02 x 10²³ molecules of oxygen

Answer 1

Correct option is (a) 24 g of Mg

Weight of Mg = 24 g

Weight of NO = 0.9 x 30 = 27 g

Weight of N₂ = \(\frac{28\times 22.4}{22.4}\) = 28 g

6.02 × 10²³ molecules of oxygen = 1 mole = 32 g of O₂