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The gas that is less dense than air is

Chemistry
WAEC 2023

The gas that is less dense than air is

  • A. nitrogen
  • B. chlorine
  • C. Carbon(IV) oxide
  • D. Oxygen
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Correct Answer: Option A
Explanation

The density of a gas is directly proportional to its molar mass. This means that gases with a lower molar mass will be less dense than gases with a higher molar mass. Nitrogen (N2) has a molar mass of 28 g/mol, which is less than that of air (approximately 29 g/mol), making it less dense than air.


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