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x ----- 3.4 átomos
x = 5.65 x 10⁻²⁴ átomos
mol = masa/Mm
Mm Ni = 58.69 g/mol
masa = 5.65 x 10⁻²⁴ mol x 58.69 g/mol
masa = 3.32 x 10⁻²² g