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1 mol Mg(OH)2
0.05 g Mg(OH)2 x ---------------------- = 8.5 x 10-4 mol
58,3 g Mg(OH)2
mol = masa/Mm
mol = 0.05 g / 58.32 g/mol
mol = 0.000857 = 8.57 x 10⁻⁴