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Gases possess characteristic critical te...

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 ?

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