Question

3. How many atoms are there in 1 kg of gold, if its atomic mass is 197 u?
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Answer 1

Let’s calculate the molar quantity of gold first.

(1000×g)/(196.97×g×mol^-1) = 5.077 mole

So we know that 1 mole of anything = 6.02214076×10^23 of individual objects.

So we can multiply this value by our molar quantity of gold.

5.077 × 6.02214076×10^23 = 3.057 × 10^24 atoms of gold.

Therefore, 1 kg of a gold bar has 3.057 × 10^24 atoms

Step-by-step explanation: