Empirical and Molecular Formulas

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

Which of the following could be a molecular formula with the empirical formula of CH₂O?

• CH₂O₂

• CHO

• C₃H₅O₃

• C₂H₄O₂

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NGSS.MS-PS1-1

What is the main difference between an empirical formula and a molecular formula?

• Empirical formulas show the exact number of atoms of each element in a molecule.

• Molecular formulas show the simplest whole-number ratio of atoms in a compound.

• Empirical formulas show the simplest whole-number ratio of atoms in a compound.

• Molecular formulas are always the same as empirical formulas.

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DOK Level 1: Recall

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DOK Level 2: Skill/Concept

What is the empirical formula of a compound that contains 40% carbon, 6.7% hydrogen, and 53.3% oxygen by mass?

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DOK Level 2: Skill/Concept

Which of the following is an example of an empirical formula?

Tags

NGSS.MS-PS1-1