Empirical and Molecular Formulas

A number in a chemical formula that tells the number of atoms in a molecule or the ratio of elements in a compound

• Coefficient

• Subscript

• Reactant

• Product

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

Tags

NGSS.HS-PS1-7

What is the empirical formula for C₄H₆?

• CH

• CH₃

• C₂H₃

• C₄H₆

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

• C3H8

• CH4

• C2H2

• C4H10

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

• C₂H₃O₂

• CH₂O

• C₂H₄O₂

• C₃H₈O₃

What is the molecular formula for a compound with the empirical formula: K₂SO₄ and a molecular mass of 696g.

• K₂SO₄

• K₈SO₁₆

• K₈S₄O₈

• K₈S₄O₁₆

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

• CH₂O

• C₂H₄O₂

• C₄H₈O₄

• C₆H₁₂O₆

MATCH THE EMPIRICAL AND MOLECULAR FORMULAS.

a

b

You are given 40.05g S and 59.95g O. Find the empirical formula for these elements.

• SO

• SO2

• SO3

• SO4

Given the following: 42.07g Na, 18.89g P, and 39.04g O, determine the empirical formula.

• NaPO2

• Na2PO3

• Na3PO4

• NaPO4

Tags

NGSS.HS-PS1-7