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Question

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? (Atomic mass of gold is 197).

A
0.9 atoms
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B
6.022×1023 atoms,
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C
0.45×1023 atoms,
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D
2.77×1021
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Solution

The correct option is C 2.77×1021
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 =Mass of goldAtomic mass of gold
=0.9197=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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