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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.
The molar mass of a substance is its relative formula mass in grams. The unit for molar mass is g/mol. For example: the M r of water is 18, so its molar mass is 18 g/mol.the M r of calcium hydroxide is 74, so its molar mass is 74 g/mol.he molar mass is the relative formula mass of a substance in grams (measured in g/mol). Mass is conserved in chemical reactions, allowing the mass of a reactant or product to be calculated if the masses of the other substances in the reaction are known.