WAEC - Chemistry (2023 - No. 29)
The gas that is less dense than air is
nitrogen
chlorine
Carbon(IV) oxide
Oxygen
Explicaţie
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.