What is the formula of this compound if:

• A compound is:

• 40.1% C

• 6.6% H

• 53.3% O

• What is the empirical formula of this compound?

• What is the molecular formula of this compound if the MW (molecular weight) is experimentally determined to be 180g/mole

Definition of percent composition by mass

THE PATHWAY to find molecular formula from % comp by mass

• % comp

• Mass

• Mole

• Empirical formula

• Empirical mass

• Compare to molecular weight

• Molecular formula

Steps to find formula from %

What if I don’t get whole #’s

Empirical Formula to Molec Formula

Steps to calculate from mass

Steps to calculate from formula