1. The problem statement, all variables and given/known data Air is a mixture of 78% nitrogen, 21% oxygen, 0.09% of argon, and 0.03% of carbon dioxide. What can be said about air? a) Air is a heterogenous mixture b) Air is a pure substance, and is made up of N, O, Ar, and C c) Air is a solution, in which nitrogen is the solvent d) Air is a solution, in which nitrogen is the solute 2. Relevant equations None 3. The attempt at a solution I put c). Am I right?