Empirical Molecular Formula Percent Composition

What is the empirical formula if you have 88.80% copper and 11.20% oxygen?

• Cu₃O₈

• CuO₄

• Cu₂O

• Cu₄O₁₀

An empirical formula:

• is a formula that calculates the coefficients of a compound in a balanced equation.

• is the simplest whole-number ratio of moles of elements in the compound.

What is the empirical formula of a molecule containing 18.7% of Lithium, 16.3% of Carbon and 65.0% of oxygen?

• CO₂Li₃

• Li₂CO₃

• Li₃CO₂

• LiCO₅

A formula with the lowest whole number ratio of elements in a compound is called

• Molecular Formula

• Chemical Formula

• Empirical Formula 

• Distance Formula

A compound is made up of 40.05% S and 59.95% O by mass. Find the empirical formula for these elements.

• SO

• SO₂

• SO₃

• SO₄

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

• Mg₄N₃

• MgN₂

• Mg₃N₂ 

• MgN

What is the empirical formula of a compound with 88.80% copper and 11.20% oxygen by mass?

• Cu₃O₈

• CuO₄

• Cu₂O

• Cu₄O₁₀

Tags

NGSS.HS-PS1-7

What is the empirical formula of a compound that is 36.84% nitrogen and 63.16% oxygen by mass?

• NO

• N₂O₃

• N₂O₄

• N₂O₅

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

• CH₂O

• C₂H₄O₂

• C₄H₈O₄

• C₆H₁₂O₆

Glycerol has a molar mass of 92.09 g/mol. Its percent composition by mass is: 39.12% C, 8.75% H, and 51.12% O. What is the molecular formula?

• C₂H₃O₂

• CH₂O

• C₂H₄O₂

• C₃H₈O₃