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a) moles = ?
1 mol --------- 6.022 x 10²³ moléculas
x ---------- 2.1 x 10²⁴ moléculas
x = 3.487 moles
b) gramos = ?
mol = masa / Mm
masa = 3.487 mol x 148.3 g/mol
masa = 517,122 g de nitrato de magnesio