Question 9
What is the total number of atoms in 5 moles of carbon dioxide molecules? (L = 6.022 × 1023)
The right answer is the one marked above.
9.033 × 1024. Molecules = 5 × 6.022 × 1023 = 3.011 × 1024. A CO2 molecule has 3 atoms, so 3.011 × 1024 × 3 = 9.033 × 1024.
3.011 × 1024 is the number of molecules, not of atoms. Multiplying by two instead of three gives 6.022 × 1024, which is only the oxygen atoms.