Question

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How many gold atoms are in a 1 kg gold bar? The chemical symbol of gold is Au. Consult
The Periodic Table in Figure 11.9 on p. 216 in the textbook. Hint: Remember 1u=1.66x10-27kg. 1 mole= 6.022x1023, which is Avogadro’s number.

Kg=1000g
Atomic weight of gold is 196.97 g/mol
No. of moles in 1000 g of gold is 1000/196.97= 5.08 mol
No. of gold atoms is 5

Answer 1

you said that
No. of moles in 1000 g of gold is 1000/196.97= 5.08 mol

so far, so good. But you need to think why they gave you Avogadro's Number. There are that many atoms of gold in 1 mole.

So, care to change your answer? Do you really think that 5 atoms of gold weighs 1 kg? Do a sanity check!