![]() Periodic Table of Elements - Sorted by Atomic Mass Average. And we can do this for all the elements in the periodic table. For potassium then, it is 39.098 g/mol which means one mole of potassium atoms weighs 39.098 g. If you need to cite this page, you can copy this text: What’s important for today’s topic is that numerically, the molar mass is equal to the average atomic mass of the given atom, so we can look it up in the periodic table.
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