Question

Arrange the gasses in order of increasing rates of diffusion (a) F2, Cl2, N2, O2 (b) HCL, NH3, NO, Kr (c) N2O, CO, NE, O3

Answer 1

We know the formula,

r1/r2 = √(M2/M1)

Where, r1 = rate of diffusion of gas with molar mass M1.

r2 = rate of diffusion of gas with molar mass M2.

So, r ∝ 1/√M

i.e. rate of diffusion ∝ 1/√ molar mass

a) Molar mass of F2 = 38 g/mol

Molar mass of Cl2 = 71 g/mol

Molar mass of N2 = 28 g/mol

Molar mass of O2 = 32 g/mol

Decreasing order of Molar mass of the gases are,

Cl2>F2>O2>N2

As,

rate of diffusion ∝ 1/√ molar mass

So, rate of diffusion follow the order,

Cl2<F2<O2<N2

b)Molar mass of HCl = 36.5 g/mol

Molar mass of NH3 = 17 g/mol

Molar mass of NO = 30 g/mol

Molar mass of Kr = 84 g/mol

Decreasing order of Molar mass of the gases are,

Kr>HCl>NO>NH3

As,

rate of diffusion ∝ 1/√ molar mass

So, rate of diffusion follow the order,

NH3<NO<HCl<Kr

C) Molar mass of N2O = 44 g/mol

Molar mass of CO = 28 g/mol

Molar mass of Ne = 10 g/mol

Molar mass of O3 = 48 g/mol

Decreasing order of Molar mass of the gases are,

O3>N2O>CO>Ne

As,

rate of diffusion ∝ 1/√ molar mass

So, rate of diffusion follow the order,

O3<N2O<CO<Ne