Empirical Formula

Which pair has the same empirical formula?

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

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

• CH₂O
• C₂H₄O₂
• C₄H₈O₄
• C₆H₁₂O₆

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

You are given the following percent composition data for a compound containing sulfur & oxygen ( 40.05% S and

59.95% O). Find the empirical formula for this compound.

• SO
• SO2
• SO3
• SO4

Nicotine contains 74.02% C, 8.71% H and 17.27% N. What is the empirical formula for nicotine?

• CHN₂

• C₅H₇N

• C₃H₅N₂

• C₂H₅N₇

Vanillin, a flavoring agent, is made up of carbon, hydrogen, and oxygen. When a sample of vanillin weighing 2.50 g is completely combusted in the presence of oxygen, 5.79 g of carbon dioxide and 1. 18 g of water are obtained. What is the

empirical formula for vanillin?

• CHO

• C₈H₈O₃

• CH₁₃

• C₆H₁₂O₆

Tags

NGSS.HS-PS1-7

A sample of copper metal reacts with oxygen to form a copper oxide compound. Use the data below to determine the empirical formula of the copper oxide compound.

Equation for the reaction is copper + oxygen -> copper oxide

Mass of copper sample before heating = 2.50 g

Mass of copper oxide formed after heating = 3.13 g

• CuO

• CuO₂

• Cu₂O

• Cu₂O₂

Tags

NGSS.HS-PS1-7

NGSS.HS-PS1-2