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Calculate the number of atoms in 39.4 g gold. Molar mass of gold is 197g mole-1.

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 Molar mass of gold is 197 g mole-1, the number of atoms = 6.0×1023 

∴ No. of atoms in 39.4g = (6.0 x 1023 x 39.4/197) = 1.2 x 1023 

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