Question

What is the total number of atoms in one unit (molecule or formula unit) of CO2?

Then what is the total number of atoms in a mole of CO2

how do I figure this out please

Answer 1

There are 6.02E23 molecules of CO2 in a mol. Since there are 3 atoms per molecule (1 C and 2 O atoms), there will be 3x that number of atoms in a mole of CO2.