Moles of various elements. All substances are made up of molecules, but the molecules have different mass. Each one of these metals and non-metallic elements has the same number of molecules but a different mass. A mole is x 10 (to the power of 23). A mole of carbon is 12 grams but a mole of mercury is grams - the same number of molecules but different masses. A mole is an SI unit defined by the International System of Units.

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