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masa soluto = %m/m x masa solc
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100
masa soluto = 120 g x 25 g/g
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100
masa soluto = 30 g
b) solucion= soluto + solvente
solvente = solucion - soluto
solvente = 120 g - 30 g = 90 g
c)d =m/v
v = m/d
v = 120g / 1.45 g/mL
V = 82.75 ml
% m/v = 30 g x 100
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82.75 mL
%m/v= 36.25 % g/mL