1. Education
You can opt-out at any time. Please refer to our privacy policy for contact information.

Discuss in my forum

How To Convert Grams To Moles - Example Problem

Worked Gram to Mole Conversion Problems

By

This is a periodic table tile for the element carbon.

This is a periodic table tile for the element carbon.

Todd Helmenstine This is a periodic table tile for the element oxygen.

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

Answer

There are 10.3 moles CO2 in 454 grams of CO2

©2014 About.com. All rights reserved.