4-4 Count atoms and molecules in molecular compounds or ions in an ionic compound

4-4-1. How many atoms of oxygen are in 1.50 mol CO₂?
A. 1.50 mol
B. 0.300 mol
C. 3.00 mol
D. 0.750 mol




4-4-2. How many cations are in 2.00 mol Na₃PO₄?
A. 0.667 mol
B. 6.00 mol
C. 0.500 mol
D. 1.00 mol