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density of gold is 19.32 g/cm^3.A piece of gold leaf is 2.50 cm on each side and 0.100 mm thick,How many atoms of gold are in this piece of gold leaf?

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volume = 2.5x2.5x.01 cm^3=.0625cm^3
mass of gold=density*volume=you do it.

massofoneatome*numberHere=massgold
numberHere=massofgold/atomicmassAu

and you can look up the atomic mass of Gold.
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