Kinetic Theory - Result Question 2

2. Two vessels separately contain two ideal gases A and B at the same temperature. The pressure of A being twice that of B. Under such conditions, the density of A is found to be 1.5 times the density of B. The ratio of molecular weight of A and B is :

[2015 RS]

(a) 34

(b) 2

(c) 12

(d) 23

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Answer:

Correct Answer: 2. (a)

Solution:

  1. (a) From PV=nRT

PA=ρAMART and PB=ρBMBRT

From question, PAPB=ρAρBMAMB=2MAMB=32

So, MAMB=34



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