Question

explain why:-
(a) The mean free path of molecules in a gas increases and number of collisions per unit time decreases with the lowering of vapour pressure.
(b) Mean free path depends on collision frequency and molecular size.​

Answer 1

Answer:

(a) Density: As gas density increases, the molecules become closer to each other. Therefore, they are more likely to run into each other, so the mean free path decreases. Increasing the number of molecules or decreasing the volume causes density to increase. This decreases the mean free path.

(b). As the number of molecules increases the probability of collision increases and thus the mean free path decreases. ... Pressure, temperature, and other physical factors also affect the density of the gas and thus affect the mean free path.