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avogadro's constant is the number of atoms (or molecules, as in the case of compounds) contained in a mole of a substance. roughly, then, in 4 moles of gold there are 4 x 6.02 x 10 to the 23rd power atoms or two septillion, four hundred eight sextilllion atoms. (2,408,000,000,000,000,000,000,000)

see also: http://en.wikipedia.org/wiki/Avogadro_constant

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