Empirical Formulas Practice

Determine the empirical formula for a compound that is 63.53 % Fe and 36.47 % S by mass.

• Fe₂S₃

• FeS

• FeS₂

• Fe₃S₂

Determine the empirical formula for a compound that is 23.3% Co, 25.3% Mo and 51.4% Cl by mass. What is the empirical formula?

• Co Mo Cl₄

• Co₃Mo₂Cl₁₁

• Co₂MoCl₃

• Co₂MoCl₉

A formula that shows the smallest whole-number mole ratio of the elements of a compound, and may or may not be the same as the actual molecular formula.

• Empirical Formula

• Molecular Formula

• Stoichiometry

• Chemical Reaction

What is the empirical formula of a substance with the molecular formula C₂H₄?

• C₂H₂

• C₂H₂

• C₁H₁

• CH₂

Which pair has the same empirical formula?

• NaCrO₄ and Na₂Cr₂O₇

• C₂H₄O₂ and C₆H₁₂O₆

• C₃H₆O₃ and C₂H₆O₂

• CH₄ and C₂H₆

Napthalene has the chemical formula C₁₀H₈. What would be the empirical formula?

• C₁₀H₈

• C₅H₄

• C₂₀H₁₆

• CH₂

• C₄H₃

Tags

NGSS.MS-PS1-1

Glucose has the formula C₆H₁₂O₆. Maltose has the chemical formula C₁₂H₂₂O₁₁. Do they have the same empirical formula?

• Yes

• No

What is the empirical formula of this substance?

• C₂H₃

• CH₃

• C₂H₆

• C₂H₂

Tags

NGSS.HS-PS1-7

What is the empirical formula of a substance with the molecular formula Se₈F₁₂?

• Se₈F₁₂

• Se₂F₃

• Se₄F₃

• SeF

What is the empirical formula of a substance with the molecular formula X₂₀Y₁₅?

• X₁₀Y₁₅

• X₅Y₃

• X₄Y₃

• X₂₀Y₁₅