In $C_a{C}_{l}2$, how many moles of chlorine atoms are present in $1$ mole of the compound?

• A. $3$ mol $Cl$
• B. $2$ mol $Cl$
• C. $0.5$ mol $Cl$
• D. $1$ mol $Cl$

Answer: (B)

Verified step by step guidance

1. Identify the chemical formula given: CaCl\_2, which means one formula unit contains 1 calcium (Ca) atom and 2 chlorine (Cl) atoms.
2. Understand that 1 mole of CaCl\_2 contains 1 mole of calcium atoms and 2 moles of chlorine atoms because the subscript '2' applies to chlorine.
3. Since the question asks for the number of moles of chlorine atoms in 1 mole of CaCl\_2, focus on the chlorine part of the formula.
4. Use the relationship: moles of chlorine atoms = moles of CaCl\_2 \times number of chlorine atoms per formula unit.
5. Calculate the moles of chlorine atoms by multiplying 1 mole of CaCl\_2 by 2 (the number of chlorine atoms in the formula), resulting in 2 moles of chlorine atoms.