Final answer:
In 5 units of calcium chloride (CaCl2), there are 10 chlorine atoms in total (5 units × 2 chlorine atoms per unit).
Step-by-step explanation:
The question provided is about calculating the number of chlorine atoms in a given chemical formula. When the formula 5 CaCl2 is presented, it indicates that there are 5 units of calcium chloride. The chemical formula of calcium chloride is CaCl2, which means each unit of calcium chloride consists of one calcium atom and two chlorine atoms.
Therefore, to find the number of chlorine atoms, you would multiply the number of units by the number of chlorine atoms in each unit:
- 5 units of CaCl2
- Each unit has 2 chlorine atoms.
- 5 units × 2 chlorine atoms per unit = 10 chlorine atoms.