Empirical Formula and Molecular Formula

Which of these is NOT an empirical formula?

• CH2

• C2H5

• C6H4

• C3H7

• C5H17

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

• CH₂O₂

• CHO

• C₃H₅O₃

• C₂H₄O₂

What is the empirical formula of K₂SO₄?

• K₂SO₄

• KSO₂

• K₂SO₂

• KSO₈

A formula that shows the smallest whole-number mole ratio of the elements of a compound, and may or may not be the same as the actual molecular formula.

• Empirical Formula

• Molecular Formula

• Stoichiometry

• Chemical Reaction

Gives the actual number of atoms of each element in a molecule of a compound.

• Empirical Formula

• Molecular Formula

• Stoichiometry

• Chemical Reaction

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

• CO₂Li₃

• Li₂CO₃

• Li₃CO₂

• LiCO₅

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.

C₂H₄ What is the empirical formula?

• CH

• CH₂

• C₄H₂

• C₂H₄

Tags

NGSS.MS-PS1-1

P₃O₄ What is the empirical formula?

• PO

• P₃O₄

• P₄O₃

Tags

NGSS.MS-PS1-1

Find the empirical formula for a compound which contains 32.8% chromium and 67.2% chlorine.

• CrCl

• CrCl₃

• Cr₃Cl

• Cr₂Cl₆