Question

Which of the following pairs contain equal number of atoms?

(a) 11.2 c.c. (S.T.P.) of the nitrogen and 0.015 g of nitric oxide

(b) 22.4 litres (S.T.P.) of nitrous oxide and 22.4 litres of nitric oxide

(c) 1 millimole of HCl and 0.5 millimole of H₂S

(d) 1 mole of H₂O₂ and 1 mole of N₂O₄

Answer 1

(a) 11.2 c.c. (S.T.P.) of the nitrogen and 0.015 g of nitric oxide

11.2 cc. of N₂(STP) = \(\frac{11.2}{22400}\) = 5 x 10^-4 mole 

0.015 g of NO = \(\frac{0.015}{30}\) = 5 x 10^-4 mole