Empirical Formulae

An empirical formula is...

• the actual formula for covalent compounds.
• the simplest whole-number ratio of atoms elements in a compound.
• only for ionic compounds.
• a description of bonds in a compound.

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

• SO
• SO₂
• SO₃
• SO₄

What is the empirical formula of the following molecular formula:  C₃H₆

• C₃H₆
• CH₂
• C₂H₄
• CH₃

Which pair has the same empirical formula?

• NaCrO₄ and Na₂Cr₂O₇
• C₂H₄O₂ and C₆H₁₂O₆
• C₃H₆O₃ and C₂H₆O₂
• CH₄ and C₂H₆

What is the empirical formula for a compound containing the following ratio:
3Na : 1P : 4O

• NaPO₄
• Na₃P₄O
• Na₃PO₄
• NaPO

Tags

NGSS.HS-PS1-7

A compound came out with the following ratio
3 Carbon: 1.49 Phosphorus: 2 Oxygen- what would be the empirical formula?

• Ca₆P₃O₄
• C₃PO₂
• C₆P₃O₄
• C₃P₃O₂

Tags

NGSS.HS-PS1-7

What is the empirical formula for a compound containing: 92.30% carbon and 7.70% hydrogen

• CH
• CH₄
• C₂H₄
• C₂H₂

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

• Cu₃O₈
• CuO₄
• Cu₂O
• Cu₄O₁₀

Tags

NGSS.HS-PS1-7

A borane is a compound containing only boron and hydrogen. If a borane is found to contain 88.45% boron, what is its empirical formula?

• B₂H₅
• B₅H₇
• B₇H₅
• B₃H₈

What is the empirical formula if you have 36.84% nitrogen and 63.16% oxygen?

• NO
• N₂O₃
• N₂O₄
• N₂O₅