A certain gas takes three times as long to effuse out as helium. Its molecular mass will be: Option 1) 36 u Option 2) 64 u Option 3) 9 u Option 4) 27 u

As we lernt in

Graham’s law of diffusion -

where r is rate of diffusion of gas , M is molar mass.

-

As per graham's law of diffusion

given that

Option 1)

36 u

Option 2)

64 u

Option 3)

9 u

Option 4)

27 u