There are of different kinds of proteins in the human body?

In humans, up to ten different proteins can be traced to a single gene. Proteome: It is now estimated that the human body contains between 80,000 and 400,000 proteins. However, they aren't all produced by all the body's cells at any given time. Cells have different proteomes depending on their cell type.

Explanation:

20 different types

GasMolar Mass (g/mole)Density at STP (g/L)

N2, nitrogen gas28.0141.25

O2, oxygen gas31.9981.43

CH4, methane gas16.0430.714

CO2, carbon dioxide44.0091.96

Explanation:

I think this is what your asking. I added a little more.