Multiple choice general knowledge history

Which is the heaviest gas?

  1. Carbon dioxide

  2. Oxygen

  3. Nitrogen

  4. Argon
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Carbon dioxide (CO2) has a molecular weight of 44 g/mol, making it the heaviest among common atmospheric gases when comparing molecular masses. At standard temperature and pressure, CO2 is about 1.5 times denser than air. Argon is actually heavier (40 g/mol) than CO2, but among the given choices and in the context of common atmospheric gases students learn, CO2 is typically taught as the heaviest common gas.

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