Question

a gold sample contains 95% of gold and rest copper. how many atoms of gold are present in one gram of this sample of gold? ​

Answer 1

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

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