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

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To determine the number of gold atoms in a 2.5g mass with 15 percent purity, first, calculate the mass of pure gold by finding 15 percent of 2.5g, which equals 0.375g. Next, convert this mass to moles by dividing by the molar mass of gold (approximately 197 g/mol), resulting in about 0.0019 moles of gold. Finally, multiply the number of moles by Avogadro's number (approximately 6.022 x 10^23 atoms/mol) to find the total number of gold atoms, which is approximately 1.14 x 10^21 atoms. This method effectively outlines the steps needed to solve the problem.
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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
 
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Not sure what kind of help you need - what you wrote sounds like a correct approach to the problem.

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