Question

a) Define Dalton's partial pressure law.
b) Critical temperature for ${CO}_2$ and ${CH}_4$ are $31.1$ and $-81.9$ respectively. Which of these has stronger inter-molecular forces and why?

Answer 1

Solution:-

(a) Dalton's law of partial pressures $\to$ It states that in a mixture of non-reacting gases, the total pressure exerted is equal to the sum of the partial pressures of the individual gases.

$P_{total}=P_1+P_2+.....+P_n$

(b) The maximum temperature at which a gas can be converted into a liquid by an increase in pressure is called its critical temperature. This means that the intermolecular forces of attraction between the molecules of a gas are directly proportional to its critical temperature.

Since the critical temperature for $C{O}_2$ is greater than that of another gas. Hence, intermolecular forces of attraction are stronger in the case of $C{O}_2$.