Question

Order the relative rate of diffusion of the following gases from slowest to fastest. Kr, N, Ar, Ne.

Answer 1

Kr, Ar, Ne, N

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Answer 2

Answer:

The increasing order relative rate of diffusion from fastest to slowest will be: N>Ne>Ar>Kr

Explanation:

Graham's diffusion law states that the rate of diffusion of gas is inversely proportional to the square root of the molecular mass of the gas. Mathematically given as:

$\text{Rate of diffusion}\propto \frac{1}{\sqrt{\text{Molecular mass of the gas}}}$

Higher the molecular mass slower will be the diffusion rate.In the given gases the molecular mass of Krypton, nitrogen ,argon and neon is 83.80 g/mol,14.01 g/mol,39.95 g/mol and 20.18 g/mol respectively.

Increasing order of molecular mass: Kr >Ar>Ne> N

So, increasing order relative rate of diffusion from fastest to slowest will be: N>Ne>Ar>Kr