Under certain conditions argon gas diffuses at a rate of 3.2 cm per second under the same conditions an unknown gas diffuses at the at a rate of 4.5 cm per second what is the approximate molar mass of the unknown gas

20 g/mol

Explanation:

We can use Graham’s Law of diffusion:

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

Squaring both sides, we get

Solve for M₂:

these nuts

i think   the answer is c hope i'm right