Percent Composition of Carbon Dioxide (CO₂)
Carbon dioxide (CO₂) has a molar mass of 44.01 g/mol: 27.29% carbon and 72.71% oxygen.
How to use this tool
- Enter h contribution, c contribution, n contribution, o contribution and other elements contribution in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your total molar mass and the full breakdown beneath it.
Find the percent composition of CO₂ by entering the carbon and oxygen molar contributions.
Frequently asked questions
- What does percent composition mean?
- It tells you what fraction (by mass) of a compound is made of each element. For example, water is about 11.2% hydrogen and 88.8% oxygen by mass.
- How do I find the element contribution?
- Multiply the element's atomic mass (from the periodic table) by the number of atoms of that element in the chemical formula.