Hi pls help me with number 4

Air can be considered a mixture. which statement does not explain why?

What is the mass of oxygen gas is consumed in a reaction that produces 4.60mol so2

The comparison of the number of atoms in a copper coin the size of a penny with the number of people on earth is made to illustrate which of the following? a. that atoms are indivisible b. that atoms are very small c. that atoms are very large d. that in a copper penny, there is one atom for every person on earth