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a) 1 mol ---- 6.022 x 10²³ atomos Pb
x ---- 3.056 x 10⁻²³ átomos Pb
x = 5.074 x 10 ⁻⁴⁷ mol Pb
b) Mm Pb = 207,2 g/mol
mol = masa/Mm
masa = mol x Mm
masa = 5.074 x 10 ⁻⁴⁷ mol x 207.2 g/mol
masa = 1.05 x 10 ⁻⁴⁴ g de plomo