Calculating Gold Atoms: Mole Concept and 15% Pure Gold Mass

[Kelly09]

How many Gold atoms are in Gold mass of 2.5g? 15 percent of the mass is pure Gold.
So first i found 15 percent of the mass which i used to calculate the number of moles. Then i multiplied the moles by Avogadros number to give me the atoms. Anyone help

 

[Borek]

Not sure what kind of help you need - what you wrote sounds like a correct approach to the problem.

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