Final answer:
The total number of atoms in the compounds Ba₃P₂, CuCl₂, MgBr₂, and N₂O₄ are 5, 3, 3, and 6, respectively.
Step-by-step explanation:
To calculate the total number of atoms in each compound, we must look at the subscripts in the chemical formulas, which indicate how many atoms of each element are present.
- Ba₃P₂ contains 3 atoms of barium (Ba) and 2 atoms of phosphorus (P), giving us a total of 3 + 2 = 5 atoms.
- CuCl₂ contains 1 atom of copper (Cu) and 2 atoms of chlorine (Cl), giving us a total of 1 + 2 = 3 atoms.
- MgBr₂ contains 1 atom of magnesium (Mg) and 2 atoms of bromine (Br), giving us a total of 1 + 2 = 3 atoms.
- N₂O₄ contains 2 atoms of nitrogen (N) and 4 atoms of oxygen (O), giving us a total of 2 + 4 = 6 atoms.