# Question #55e59

Oct 4, 2015

Less molar mass

#### Explanation:

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

Oct 4, 2015

Nitrogen gas is less dense than air.

#### Explanation:

Nitrogen is lighter than air because it has a lower density than air. The density of ${\text{N}}_{2}$ gas at STP is $\text{1.2056 kg/m"^3}$, and the density of air at STP is $\text{1.293 kg/m"^3}$. So, there is less mass of ${\text{N}}_{2}$ per cubic meter, and a greater mass of air per cubic meter.

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