Which of the following is the correct molar mass for the compound FeSO_4?

• A. 135.86 g/mol
• B. 169.87 g/mol
• C. 151.91 g/mol
• D. 123.82 g/mol

Answer: (C)

Verified step by step guidance

1. Identify the chemical formula of the compound, which is FeSO_4, consisting of one iron (Fe) atom, one sulfur (S) atom, and four oxygen (O) atoms.
2. Find the atomic masses of each element from the periodic table: Fe ≈ 55.85 g/mol, S ≈ 32.07 g/mol, and O ≈ 16.00 g/mol.
3. Calculate the total mass contributed by each element by multiplying the atomic mass by the number of atoms in the formula: Fe (1 × 55.85), S (1 × 32.07), O (4 × 16.00).
4. Sum the masses of all elements to find the molar mass of FeSO_4 using the formula: \(\text{Molar mass} = (1 \times 55.85) + (1 \times 32.07) + (4 \times 16.00)\).
5. Compare the calculated molar mass with the given options to determine which value matches the correct molar mass of FeSO_4.