QUESTION $3$: GAS DIFFUSION COEFFICIENT

a$)$ During the Gas Diffusion experiment a drop in liquid level was observed as the time elapsed. Please explain this phenomenon?

$4$

b$)$ The diffusivity of vapour of a volatile liquid in air can be conveniently determined by Winklemann's method in which liquid is contained in a narrow diameter vertical rube, maintained at constant temperature. Elaborate on the rate of diffusion if the diameter of the tube is doubled?

c$)$ Acetooe was used during the experiment as the volatile liquid. Explain what is meant by the volatility of the liquid.

$[2]$

Total: $8$ marks

TOTAL: $31$ MARKS