Calculating Empirical and Molecular Formulas

What is the compound formed when 1.46 mol Fe combines with 1.95 mol O?

• FeO₂

• FeO

• Fe₃O₄

• Fe₄O₃

A compound has the empirical formula CH. The molecular mass is found to be somewhere between 75 - 80 g/mol. What is the molecular formula of the compound?

• C₂H₂

• C₃H₃

• C₅H₅

• C₆H₆

A compound has the molecular formula C₁₂H₂₄O₆. What is the empirical formula of this compound?

• CHO

• C₂H₄O

• C₆H₁₂O

• CH₂O

A compound has the molar mass of 170.0 g/mol and an empirical formula of SiF₃. The compounds molecular formula is

• SiF₃

• Si₂F₆

• Si₅F₁₅

• Si₄F₁₂

A 50.00 gram sample of a compound is analyzed and found to contain 21.85 g phosphorus and 28.15 g of oxygen. What is the empirical formula for this compound?

• PO₂

• P₂O

• P₂O₅

• P₃O₂