Question

A and B are two identical vessels. A contains 15 g ethane at 1atm 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

Answer: (A)

75

Answer 2

$\frac{15}{30} = \frac{75}{M_{B}}$

MB = 150. (V.D.)B = $\frac{150}{2}$ = 75.