Question

The rate of diffusion of methane at a given temperature is twice that of gas X. The molecular weight of X is

• A. 64.0
• B. 32.0
• C. 4.0
• D. 8.0

Answer 1

Answer: (A)

64.0

Answer 2

$\frac { r _ { C H _ { 4 } } } { r _ { X } } = \sqrt { \frac { M _ { X } } { M _ { C H _ { 4 } } } } \Rightarrow 2 = \sqrt { \frac { M _ { X } } { 16 } } \Rightarrow M _ { X } = 64$.