a gold sample contains 90% of gold and the rest copper how many atoms of gold are present in 1 gram of this sample of gold
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1 Gram of gold contains 0.9 grams of gold
=0.9/197
=0.0046
One mole of gold contains NA atoms = 6.022×10^3
Therefore, 0.0046 mole of gold will contain= 0.0046 × 6.022 =2.77×10^2
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