A gold sample contains 90% of gold and the rest copper .how many atoms of gold are present in one gram of this sample of gold?
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one gram of gold sample will contain 90/100=0.9 g of gold
number of moles of gold= Mass of gold/atomic mass of gold
= 0.9/197
=0.0046 moles
one mole of gold contain NA atoms = 6.022*10^23
0.0046 mole of gold will contain = 0.0046*6.022*10^23
=2.77*10^21 atoms
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