8. 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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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
=
197
0.9
=0.0046
According to mole concept,
One mole of gold contains N
A
atoms =6.022×10
23
atoms,
∴0.0046 mole of gold will contain =0.0046×6.022×10
23
=2.77×10
21
Explanation:
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