Question :-
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A gold sample contains 90% of gold and the rest Copper. How many atoms of golds are presents in one gram of this sample of gold?
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ANSWER
As sample is 90% pure wrt to Gold,
So one gram of sample will have 90/100=0.9gm gold.
Number of moles of gold =
Atomic mass of gold
Mass of gold
0.9
197 = 0.0046
According to mole concept,
One mole of gold contains NA atoms
= 6.022×10²³ Atoms
∴0.0046 mole of gold will contain
= 0.0046×6.022×10²³
=2.77×10²¹
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