Writing Empirical and Molecular Formulas

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.

S₂O₈ What is the empirical formula?

• S₂O₈

• SO

• SO₄

• S₈O₂

C₂H₆O What is the empirical formula?

• CHO

• C₂H₆O

P₃O₄ What is the empirical formula?

• PO

• P₃O₄

• P₄O₃

Tags

NGSS.MS-PS1-1

When calculating the empirical formula the mole ratio is given as follows: H₁O_3.5 What will the EF be?

• H₁O_3.5

• HO_3.5

• HO₄

• H₂O₇

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

What is the empirical formula for C₄H₆?

• CH

• CH₃

• C₂H₃

• C₄H₆

Tags

NGSS.MS-PS1-1

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

Tags

NGSS.HS-LS1-6