Which of the following gases will have the highest rate of diffusion

According to Graham’s law, at constant temperature and pressure the rate of diffusion of gas is inversely proportional to square root of its molecular mass.

$\mathrm{r} \mathrm{\alpha } \frac{1}{\sqrt{\mathrm{M}}}$

Based on the above statement, if molecular mass of a gas is low, then the rate of diffusion is high.

Molar mass of ${\mathrm{O}}_2=32$

Molar mass of ${\mathrm{CO}}_2=44$

Molar mass of ${\mathrm{NH}}_3=17$

Molar mass of ${\mathrm{N}}_2=28$

In the above all gas molecules, ammonia ${\mathrm{NH}}_3$ has lowest molar mass. So that ${\mathrm{NH}}_3$ has the highest rate of diffusion among the given all gases.

has the highest rate of diffusion among the given all gases.