Which gas will diffusion faster within a system?

Carbon dioxide

Water vapor

Ammonia (NH3)

Methane (CH4)

Methane (CH₄).

Explanation:

Thomas Graham found that, at a constant temperature and pressure the rates of effusion of various gases are inversely proportional to the square root of their masses.

∨ ∝ 1/√M.

where, ∨ is the rate of diffusion of the gas.

M is the molar mass of the gas.

∨₁/∨₂ = √ (M₂/M₁)

The molar mass of different choices:

Carbon dioxide: 44.01 g/mol.

Water vapor : 18.0 g/mol.

Ammonia (NH₃) : 17.0 g/mol.

Methane (CH₄) : 16.0 g. mol.

Since, methane has the lowest molar mass. So, it will diffuse faster within a system.