What is the molar mass of iron(III) chloride, FeCl_3?

• A. 162.20 g/mol
• B. 197.34 g/mol
• C. 126.75 g/mol
• D. 55.85 g/mol

Answer: (A)

Verified step by step guidance

1. Identify the chemical formula of iron(III) chloride, which is FeCl\_3. This means the compound contains 1 atom of iron (Fe) and 3 atoms of chlorine (Cl).
2. Find the atomic masses of each element from the periodic table: iron (Fe) has an atomic mass of approximately 55.85 g/mol, and chlorine (Cl) has an atomic mass of approximately 35.45 g/mol.
3. Calculate the total mass contributed by each element in the compound by multiplying the atomic mass by the number of atoms: for Fe, multiply 55.85 g/mol by 1; for Cl, multiply 35.45 g/mol by 3.
4. Add the masses of all atoms together to find the molar mass of FeCl\_3 using the formula: \(\text{Molar mass} = (1 \times \text{atomic mass of Fe}) + (3 \times \text{atomic mass of Cl})\).
5. Sum the values obtained to get the total molar mass of iron(III) chloride in grams per mole.