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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.
1 6.02 x 1023 H atoms weigh how much? answer: 1.0 gram. 2  one mole of carbon dioxide weighs how much? answer: 44.0 grams (add up one C and two O). 3  Molar ratios-Use molar ratios to go between moles of a molecule and moles of its atoms. 4  The ratio of atoms per molecule such as (2 H / 1 H2O) is a molar ratio. The periodic table shows us the mass of one mole of atoms for each element. ( 2 MM). 3  6.02 x 1023 carbons atoms = one mole = 12.0 grams thus 12.0 g/mol for carbon. 4  6.02 x 1023 oxygen atoms = one mole = 16.0 grams thus 16.0 g/mol for oxygen.