How many moles of FeCl_2 are present in 85.2 g of FeCl_2?

• A. 0.671 moles
• B. 0.672 moles
• C. 2.35 moles
• D. 1.32 moles

Answer: (A)

Verified step by step guidance

1. Identify the given quantity and what is asked: You have 85.2 grams of FeCl_2 and need to find the number of moles.
2. Calculate the molar mass of FeCl_2 by adding the atomic masses of its elements: Fe (iron) and Cl (chlorine). Use the atomic masses from the periodic table, for example, Fe ≈ 55.85 g/mol and Cl ≈ 35.45 g/mol.
3. Write the formula for molar mass of FeCl_2: \(\text{Molar mass} = 55.85 + 2 \times 35.45\) g/mol.
4. Use the formula to find moles from mass: \(\text{moles} = \frac{\text{mass}}{\text{molar mass}}\).
5. Substitute the given mass (85.2 g) and the calculated molar mass into the formula to find the number of moles of FeCl_2.