(i) Write down van der waals equation for 1 mol of a gas and hence deduce the equation for the same for n mol of the gas.
(ii) Arrange `CO_(2),SO_(2) and NO_(2)` gases in increasing order of their rates of diffusion iunder the same condition of temperature and pressure wil reason.

Explanation

(ii) Increasinng order of molar mass:
`M_(CO_(2)) lt M_(NO_(2)) lt M_(SO_(2))`.
At constannt temperature and pressure the rate of diffusion of a gas is inversely proportional to the square root of molar mass of the gas. Hence increasing order of rates of diffusion is:
`r_(SO_(2)) lt r_(NO_(2)) lt r_(CO_(2))`.