Convert the moles to the mass of the element.
What is the molar percentage and mass percentage of each element in carbon dioxide?
Carbon dioxide has two oxygen atoms combined with one carbon atom:
One "mole" of
Let's use the ATOMIC definition for this example, so we have two "moles" of
So then, our "molar percentages" of
To find the mass percentage we need to multiply a mole unit by the molecular weight. This is
Again, we have 2 moles of "O", so it will have a mass of
The carbon will have a mass of
Thus, the mass of a mole of