a chemical mass
unit, defined to be 6.022 x 1023 molecules
, or some other unit. The mass
of a mole is the gram formula mass of a substance.
1 mole of NH3
has 6.022 x 1023 molecules
and weighs about 17 grams. 1 mole of copper
has 6.022 x 1023 atoms
and weighs about 63.54 grams.
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