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If you were trying to find the molar mass of the compound carbon dioxide, which looks like this-CO2-and the molar mass is 44. Then, to find the molar mass of the compound, you’re going to add all those products together. By multiplying the atomic mass by the subscript you’re getting the product, you’re getting the molar mass product for that atom. That way, you’re finding the total molar mass for all of that atom because you’re finding the atomic mass, then you’re multiplying it by however many times it appears in the compound. After you’ve found the atomic mass, multiply the atomic mass by the subscript. You’re going to start with one atom at a time. I’m going to show you a 3-step process for finding the molar mass of a compound.įirst, find the atomic mass of an atom. You kind of follow the same protocol for finding the molar mass of an element, but then you combine all those molar masses together to find the molar mass of the compound. Now the molar mass of a compound can be calculated by summing the molar masses of each atom and the chemical formula. That’s how you find the molar mass of an element. Now we’ll write it with a different unit because it’s also our molar mass, and that will be grams over moles: \(\frac\). If you’re looking at the element of copper you would look in the periodic table and find that it has an average atomic mass of 63.55 AMU, so that’s the molar mass. If you’re trying to find the molar mass of an element, then you’ll take the average atomic mass listed in the periodic table. To calculate the molar mass of a substance you need a periodic table and the chemical formula. The mass of a mole of substance is called the molar mass.
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