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

Question

A and B are two identical vessels. A contains 15 g of ethane at 298 K and 1 atm. The vessel B contains 75 g gas X2 at the same temperature and pressure. The vapour density of X2 is: (A) 300 (B) 375 (C) 150 (D) 75

Tardigrade Admin · Accepted Answer

From gas equation, P1V1=n1⋅ RT1=(w1/m1)⋅ RT1 ?(i) P2V2=(w2/m2)⋅ RT2 ?(ii) As, P1=P2, V1=V2 hence, T1=T2 Hence, (w1/m1)=(w2/m2) ∴ (15/30)=(75/m2) ( ∵ molecular weight of ethane = 30) ∴ m2=150 Hence, vapour density of X2 gas is =(M/2)=(150/2)=75

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

300

375

150

75

Q. A and B are two identical vessels. A contains 15 g of ethane at 298 K and 1 atm. The vessel B contains 75 g gas $X_{2}$ at the same temperature and pressure. The vapour density of $X_{2}$ is: