The gas that is less dense than air is
A.
nitrogen
B.
chlorine
C.
Carbon(IV) oxide
D.
Oxygen
Correct answer is A
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.
