• Share
Send to a Friend via Email

Your suggestion is on its way!

An email with a link to:

was emailed to:

Thanks for sharing About.com with others!

Discuss in my forum

How To Convert Grams To Moles - Example Problem

Worked Gram to Mole Conversion Problems

This is a periodic table tile for the element carbon.

Todd Helmenstine

This is a periodic table tile for the element oxygen.

Todd Helmenstine

This worked example problem shows how to convert the number grams of a molecule to the number of moles of the molecule.

Problem

Determine the number of moles of CO2 in 454 grams of CO2.

Solution

First, look up the atomic masses for carbon and oxygen from the Periodic Table. The atomic mass of C is 12.01 and the atomic mass of O is 16.00. The formula mass of CO2 is:

12.01 + 2(16.00) = 44.01

Thus, one mole of CO2 weighs 44.01 grams. This relation provides a conversion factor to go from grams to moles. Using the factor 1 mol/44.01 g:

moles CO2 = 454 g x 1 mol/44.01 g = 10.3 moles

There are 10.3 moles CO2 in 454 grams of CO2

Anne Marie Helmenstine, Ph.D.