Question

between o2 and Nh3 which will diffuse faster at Ntp and why

Answer 1

NH3 diffuses faster than O2

less molecular weight always diffuses faster than compared to more molecular weight gases

for NH3 it is about 17 and O2 it'll be 32.

hence NH3 diffuses faster..

Answer 2

Answer : The $NH_3$ will diffuse faster because of the lower molar mass.

Explanation :

According to the graham's law of diffusion, the rate is inversely proportional to the square root of the mass.

Or, we can say that the lower the molar mass of gas higher will be the rate of diffusion of gas that means the gas will diffuse faster.

The formula of the rate of diffusion of two gas will become,

$\frac{R_{O_2}}{R_{NH_3}}=\sqrt{\frac{M_{NH_3}}{M_{O_2}}}$

where,

$R_{O_2}$ = rate of diffusion of oxygen gas

$R_{NH_3}$ = rate of diffusion of $NH_3$ gas

$M_{O_2}$ = molar mass of oxygen gas = 32 g/mole

$M_{NH_3}$  = molar mass of $NH_3$ gas = 17 g/mole

Now put all the given values in this formula, we get

$\frac{R_{O_2}}{R_{NH_3}}=\sqrt{\frac{17}{32}}=0.728$

From this we conclude that the rate of diffusion of $NH_3$ is greater than the $O_2$.

Hence, the $NH_3$ will diffuse faster because of the lower molar mass.