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10g subst.-----100g roztworu
xg subst.-------50g roztworu
x=10*50/100
x=5g subst.
Dolewam 20g wody, więc masa roztworu wynosi 70g
5g subst.-----70g roztworu
xg subst.-----100g roztworu
x=5*100/70
x=7,14g
x=7,14%
Powstanie 7,14% roztwór H2SO4