What is the mass percent of iron in FeO?

• A. 63.5%
• B. 77.7%
• C. 55.8%
• D. 44.1%

Answer: (A)

Verified step by step guidance

1. Identify the chemical formula of the compound, which is FeO, meaning it contains one atom of iron (Fe) and one atom of oxygen (O).
2. Find the atomic masses of iron and oxygen from the periodic table: iron (Fe) has an atomic mass of approximately 55.85 g/mol, and oxygen (O) has an atomic mass of approximately 16.00 g/mol.
3. Calculate the molar mass of FeO by adding the atomic masses of iron and oxygen: \(\text{Molar mass of FeO} = 55.85 + 16.00\) g/mol.
4. Calculate the mass percent of iron in FeO using the formula: \(\text{Mass \% of Fe} = \left( \frac{\text{Atomic mass of Fe}}{\text{Molar mass of FeO}} \right) \times 100\%\).
5. Substitute the values into the formula and simplify to find the mass percent of iron in FeO.