How many moles are present in 23.4 g of CaCl_2?

• A. 0.211 g
• B. 0.211 mol
• C. 0.211 mol
• D. 0.211 mol

Answer: (C)

Verified step by step guidance

1. Identify the given information: the mass of calcium chloride (CaCl\_2) is 23.4 g, and you need to find the number of moles.
2. Calculate the molar mass of CaCl\_2 by adding the atomic masses of its elements: calcium (Ca), chlorine (Cl). Use the periodic table values: Ca = 40.08 g/mol, Cl = 35.45 g/mol. So, molar mass = 40.08 + 2 \times 35.45 g/mol.
3. Use the formula relating moles, mass, and molar mass: \(\text{moles} = \frac{\text{mass}}{\text{molar mass}}\).
4. Substitute the given mass (23.4 g) and the calculated molar mass into the formula to find the number of moles.
5. Perform the division to get the number of moles of CaCl\_2 present in 23.4 g.