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P Soluto = 25 g MgCl2
p solvente = 125 g de agua
1º. se prepara la solucion con la formula:
p solución = peso soluto + peso solvente
p solc. = 25 + 125 g = 150 g de solucion
2º. calcular el porcentaje aplicando la fórmula
% p/p = 25 g x 100
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150 g
% p/p = 16.66%