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Best Answer: Carbon dioxide is CO2, therefore each molecule has 3 atoms, one carbon and two oxygen. Carbon monoxide is CO, so 2 atoms.est Answer: Carbon dioxide is CO2, therefore each molecule has 3 atoms, one carbon and two oxygen. Carbon monoxide is CO, so 2 atoms.
The molar mass of carbon monoxide or CO is 28.01 grams per mole. Scientists determine the molar mass of a compound by adding the atomic mass of each element contained in the molecule. The atomic mass of carbon is 12.01, and the atomic mass of oxygen is 16. Continue Reading.