Asample of an unknown gas takes 222 s to diffuse through a porous plug at a given temperature. at the same temperature, n2(g) takes 175 s to diffuse through the same plug. what is the molar mass of the unknown gas?

Explanation:

Graham’s Law applies to the diffusion of gases:

The rate of diffusion (r) of a gas is inversely proportional to the square root of its molar mass (M).

If you have two gases, the ratio of their rates of diffusion is

The time for diffusion is inversely proportional to the rate.

Data:

t₂ = 222 s

 t₁ = 175 s

M₁ = 28.01

Calculation :

the answer is either b or c