19.7 kg of gold was recovered from smuggler , how many atom of gold were discovered ?
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The mass of gold =19.7 kg =19.7×1000 g =19700 g.
The atomic mass of gold is 197 g/mol.
The number of moles of gold
197g/mol
19700g
=100 mol.
The number of atoms of gold =100×6.02×10
23
=6.02×10
25
.
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