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The Periodic Table states that the molar mass of copper is 63.546 grams per mole.

That means that if you have one mole of copper, it will weigh 63.546 grams. One mole is 6.022x1023 (Avogadro's number) atoms.

To find the mass of one copper atom in grams, you simply divide copper's molar mass by the number of atoms in one mole.

63.546 / 6.022x1023 = 1.055x10-22

One atom of copper weighs 1.055x10-22 grams.

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