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d=m/v
m=d*v=100*1,14=114g-masa roztworu
100g roztw----20g subst
114g roztw----x
x=22,8g masa H2SO4
5g----95gH2O
22,8g----y
y=433,2g H2O
433,2-91,2=342g
zeby otrzymać roztór 5% nalezy dodac 342g wody