Since there is no such thing as a mole of copper, you can’t divide the total number of atoms by the number of atoms in one penny. To solve this problem, we have to convert the mass of copper to moles first.

First, we need to find out how many grams make up one mole of copper. The atomic mass of copper is 63.546 g/mol, so one mole of it would weigh 63.546 g. Since one mole equals 602149925000000000000♠1.0×1023 molecules or particles, we need to multiply 63.546 g by 602149925000000000000♠1.0×1023 molecules or particles per mole:

63.546 x 602149925000000000000♠1.0 x 1023 = 3.8 x 1022 kilograms per mole.

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Last modified: September 24, 2022