Empirical and Molecular Formulas

You are given the following percentages: 40.05% S and 59.95% O. Find the empirical formula for these elements.

• SO

• SO₂

• SO₃

• SO₄

A compound contains 52.00% Carbon, 13.00% Hydrogen, and 35.00% Oxygen by mass. What is the empirical formula of the compound?

• CH₄O

• C₃H₆O

• C₂H₅OH

• C₃H₈O

Given the mass percentages of 28.07% Na, 1.20% H, 14.30% C, and 56.43% O in a compound, determine its empirical formula.

• NaHCO₃

• Na₂CO₃

• NaCHO₂

• NaOH

If a compound is 85.63% gold and 14.37% silicon by mass, what is the empirical formula of the compound?

• AuSi

• Au₂Si

• AuSi₂

• Au₂Si₃

A compound is found to contain 69.94% zinc and 30.06% oxygen by mass. What is the empirical formula of the compound?

• ZnO

• Zn₂O

• ZnO₂

• Zn₃O₄

Given a compound with 40.00% carbon, 6.72% hydrogen, and 51.28% nitrogen by mass, determine its empirical formula.

• CH₂N

• C₂H₅N

• CH₄N₂

• C₃H₇N₃

If a compound consists of 45.88% potassium, 6.73% carbon, and 18.39% oxygen by mass, what is its empirical formula?

• KCO

• K₂CO₃

• KC₂O₃

• KCO₂

A compound has a composition of 55.84% iron (Fe) and 44.16% oxygen (O) by mass. What is the empirical formula of this compound?

• FeO

• Fe₂O₃

• FeO₂

• Fe₃O₄

Given a compound with 63.55% copper (Cu), 8.94% oxygen (O), and 27.51% chlorine (Cl) by mass, determine its empirical formula.

• CuOCl

• Cu₂OCl₂

• CuO₂Cl

• Cu₉O₅Cl₇

If a compound consists of 70.94% carbon (C) and 24.06% hydrogen (H) by mass, what is its empirical formula?

• CH

• CH₄

• C₂H₆

• C₃H₈