How many moles of Cl are present in one mole of CaCl2?

• A. 3 moles
• B. 2 moles
• C. 1 mole
• D. 0.5 mole

Answer: (B)

Verified step by step guidance

1. Identify the chemical formula of the compound given, which is CaCl\_2.
2. Recognize that the subscript number in the formula indicates the number of atoms of that element in one mole of the compound. Here, the subscript 2 next to Cl means there are 2 atoms of chlorine per formula unit of CaCl\_2.
3. Since one mole of CaCl\_2 contains Avogadro's number of formula units, the number of moles of Cl atoms will be the subscript multiplied by the number of moles of CaCl\_2.
4. Express this relationship mathematically as: number of moles of Cl = 2 \times (number of moles of CaCl\_2).
5. Therefore, in one mole of CaCl\_2, there are 2 moles of Cl atoms.