Now, let's see what this looks like with real chemicals. Carbon dioxide is a common compound that we have surrounding us on a daily basis. What is the percent of carbon and oxygen in carbon dioxide?

You will use the following formula to find the percent of carbon in CO2.

Source: Carbon dioxide molecule, British Columbia School Superintendents Association

Grams of carbon Grams of carbon dioxide × 100

The amount of grams of carbon in 1 mole is 12.01 grams and the total amount of grams in 1 mole of carbon dioxide is 44.01 grams. Use these masses in the formula above.

12.01 grams of C 44.01 grams of CO2 × 100

What is the percent of carbon in CO2, round your answer to the nearest hundredth place?

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27.29%

The amount of grams of oxygen in 1 mole of O2 is 32.00 grams, and the total amount of grams in 1 mole of carbon dioxide is 44.01 grams. What is the percent of oxygen in CO2, round your answer to the nearest hundredth place?

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72.71%