Master Empirical and Molecular Formulas 2

A compound consists of 72.2% magnesium(Mg) and 27.8% nitrogen(N) by mass. What is the empirical formula?

• Mg₄N₃
• MgN₂
• Mg₃N₂ 
• MgN

Which of the following is considered an empirical formula?

• CH₃COOH

• C₆H₁₂O₆

• H₂O

• C₃H₆

What is the empirical formula if you have 81.82% carbon and 18.18% hydrogen?

• C3H8
• CH4
• C2H2
• C4H10

A compound is found to have 52.0 % zinc (Zn), 9.6 % carbon (C), and 38.4 % oxygen (O). What is the empirical formula?

• Zn₂(CO₃)₂

• Zn₂C₂O₆

• ZnCO

• ZnCO₃

What is the molecular formula if the empirical formula is CH₂O and the molecular molar mass is 180.18?

• CH₂O
• C₂H₄O₂
• C₄H₈O₄
• C₆H₁₂O₆

C₆H₆

• Empirical
• Molecular

Na₂S₂O₃

• Empirical
• Molecular

What is the molecular formula if the empirical formula is C₂H₅ and the molecular molar mass is 87 g/mol?

• C₂H₅

• C₄H₁₀

• C₆H₁₅

• C₄H₈

What is the molecular formula for a compound with the empirical formula: K₂SO₄ and a molecular mass of 348g.

• K₂SO₄

• K₈SO₁₆

• K₄S₂O₈

• K₈S₄O₁₆

What is the molecular formula of a compound with an empirical formula of C₂OH₄ and a molar mass of 132 grams?

• C₆O₃H₁₂

• C₈O₂H₄

• C₄O₂H₈

• C₄O₈H₂