Question

A gold sample contains 90% of gold and the rest Copper. How many atoms of golds are presents in one gram of this sample of gold?

Answer 1

Relative Atomic Mass of Gold = 197

Meaning 197 g of Gold contains 6.02 x 10∧23 atoms of Gold (Avogadro's No.)

Mass of gold in the sample = 90% x 1 g = 0.9 g

If 197 g ≡ 6.02 x 10∧23 atoms

∴ 0.9 g ≡ (0.9 x 6.02 x 10∧23) ÷ 197

            ≡ 2.75 x 10∧21 atoms

Answer 2

Answer:

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