Question

Question #55e59

Answer 1

Less molar mass

Explanation:

Nitrogen has a smaller molar mass (14) than oxygen (16). Hope it helps :D .

Answer 2

Nitrogen gas is less dense than air.

Explanation:

Nitrogen is lighter than air because it has a lower density than air. The density of `"N"_2` gas at STP is `"1.2056 kg/m"^3"`, and the density of air at STP is `"1.293 kg/m"^3"`. So, there is less mass of `"N"_2` per cubic meter, and a greater mass of air per cubic meter.

http://www.engineeringtoolbox.com/gas-density-d_158.html