Question

The critical temperature of ${\mathrm{CO}}_2$ gas and the${\mathrm{N}}_2$gas are 31^oC and -147⁰C, respectively. Which gas is liquefied easily and why?

Answer 1

Critical temperature: It is defined as the temperature above which a gas can not be liquefied whatever pressure may apply.

• Between ${\mathrm{CO}}_2$gas and ${\mathrm{N}}_2$ gas, ${\mathrm{CO}}_2$ has a high critical temperature.
• Intermolecular forces of attraction between ${\mathrm{CO}}_2$ are strong because it has a high critical temperature.
• Because of these high intermolecular forces of attraction of ${\mathrm{CO}}_2$_, it is easily liquefiable.