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Unformatted text preview: grams of Cu 1 mole Cu 6.02 x 10 23 atoms Cu = atoms Cu (number) (unit) (number) (unit) 63.54 grams Cu 1 mole Cu (number) (unit) (number) (unit) There is no direct conversion between grams of copper and number of copper atoms. Here you must first use the atomic mass to convert to moles and then use Avogadro's number to convert to atoms. Note that the units grams Cu "cancel out" in the first conversion, leaving units of moles. Moles then cancel out in the second conversion, leaving units of atoms Cu . The value you are converting FROM always goes on the bottom of the first conversion factor. The value you are converting TO always goes on the top of the last conversion factor. Use two or more conversion factors whenever you do not have a direct relation between units....
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- Spring '09