Question

A and B are two identical vessels.. A contains 15 g ethane at 1 atm and 298 K. The vessel B contains 75 g of a gas X₂ at same temperature and pressure. The vapour density of X₂ is

(a) 75

(b) 150

(c) 37.5

(d) 45

Answer 1

Correct option is (a) 75

V.D. of gas X₂ referred to ethane = 75/5 = 5

V.D. of ethane referred to hydrogen 30/2 = 15

V.D. of gas X₂ (H₂ = 1) = 5 x 15 = 75