What are the two most abundant chemicals in air?

The most abundant chemical/gas is Nitrogen, which makes up about 78% and Oxygen at second place with approximately 21%

Nitrogen and Oxygen because about 70% of air is nitrogen and around 20% of air is Oxygen.

Hope this helps!

in chemistry, a solution’s concentration is how much of a dissolvable substance, known as a solute, is mixed with another substance, called the solvent. the standard formula is c = m/v, where c is the concentration, m is the mass of the solute dissolved, and v is the total volume

i think   the answer is c hope i'm right