A gold sample of gold and the rest copper. Hoe many atoms of gold are present in one gram of this sample of gold ?

Answer: 2.77 × 1021 atoms

One gram of gold sample will contain 90/100 = 0.9g of gold

Number of moles of gold = mass of gold / atomic mass of gold

Number of moles of gold = 0.9/19.7

Number of moles of gold = 0.0046

One mole of gold contains NA atoms = 6.022 × 1023

∴ 0.0046 mole of gold = 0.0046 × 6.022 × 1023

0.0046 mole of gold = 2.77 × 1021 atoms

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