Gases possess characteristic critical temperature which depends upon the magnitude of intermolecular forces between the gas particles. Critical temperatures of ammonia and carbon dioxide are 405.5 K and 304.10 K respectively. Which of these gases will liquify first when you start cooling from 500 K to their critical temperature ?

Explanation

Ammonia will liquify first because its critical temperature will be reached first. Liquifaction of `CO_(2)` will require more cooling.