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12.5 % m/v
m soluto = ?
v solucon = =?
%m/v = masa soluto / v solucion x 100
m soluto = %m/v x v solucion / 100
m soluto = 12.5 g/mL x 200 mL / 100
m soluto = 25 g de cloruro de sodio
v solucion = masa soluto + v solvente
v solvente = 200 mL - 25 g
v solvente = 175 mL de agua