There are \approx imately 5.5 x 10^22 gold atoms in a 1 kg gold bar. This can be calculated by using the molar mass of gold (197 g/mol) and Avogadro's number (6.022 x 10^23 atoms/mol). First, convert the mass of the gold bar to grams (1000 g). Then, divide 1000 g by the molar mass of gold to get the number of moles (5.08 mol). Finally, multiply the number of moles by Avogadro's number to get the number of atoms (5.5 x 10^22 atoms). Note that this is an \approx imation, as the actual number of atoms can vary slightly due to impurities in the gold bar.
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