Question

In an experiment to study the speed of diffusion of two gases namely hydrogen chloride and ammonia,what is the result?

Answer 1

The hydrochloric acid gives off hydrogen chloride gas and ammonia solution gives off ammonia gas

Both gases react together to form a white fumes of ammonium chloride

Answer 2

Answer:

Ammonia will diffuse at a faster rate than hydrogen chloride.

Explanation:

From Graham's law of diffusion we have,

$r\propto\frac{1}{\sqrt{M} }$            (1)

Where,

r=rate of diffusion

M=molecular weight of the gas

So, from equation (1) we can say that the rate of diffusion is inversely proportional to the molar mass of the gas.

We can also write equation (1) as,

$\frac{r_1}{r_2}=\sqrt{\frac{M_2}{M_1} }$       (2)

The molar mass of hydrogen chloride(M₁)=36.5g/mol

The molar mass of ammonia(M₂)=17g/mol

$M_1 > M_2$

Hence, ammonia will diffuse at a faster rate than hydrogen chloride.