What is the Molecular Weight of Air

Answer: Usually, the air is a mixture of several gasses, which consist of oxygen, nitrogen, argon, and carbon dioxide. Air is a mixture of several gasses where the two most dominant presences in dry air are 21% oxygen and 78% nitrogen, along with 0.934% Argon and carbon dioxide of about 0.03%. 

Therefore, the atomic weight of the following are as follows 

Nitrogen – 28.0134 g/mol 

Oxygen – 31.9988 g/mol 

Argon – 39.948 g/mol 

Carbon Dioxide – 44.01 g/mol 

Weight of each gas with help of its percentage

Nitrogen – 21.8739 g/mol

Oxygen – 6.7025 g/mol

Argon – 0.373 g/mol 

Carbon Dioxide – 0.013203 g/mol 

Now we need to add of values that we get from the above weight of the gas 

We get 28.96 g/mol. Therefore 28.96 g/mol is the molecular weight of Air.