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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.
One mole of carbon atoms has a mass of exactly 12 g. Because magnesium atoms each have twice the mass of carbon atoms (24 Mg compared with 12 C), one mole of magnesium has a mass of 24 g. In fact, one mole of any element has a mass in grams that is equal to its relative atomic mass. One mole of iron has a mass of 56 g. Moles of compounds A mole of a molecular compound contains 6 x 10 23 molecules. It has a mass that is equal to its relative formula mass. So a mole of water (H 2 O) has a mass of 18 g. A mole of carbon dioxide (CO 2) has a mass of 44 g.