NCERT Solution: Atoms and Molecules
Long Answer Type
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?
One gram of gold sample will contain 90 /100 = 0.9 gram of gold
Number of moles of gold =mass of gold / atomic mass of gold
0.9 / 197 = 0.0046
One moles of gold contains NA atoms = 6.022 x 1023
∴0.0046 mole of gold will contain = 0.0046 x 6.022 x 1023
= 2.77 x 1021
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