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Dane:
ms=25[g].
Cp=5%.
Wzór:
Cp=(ms*100%)/mr.
5%=(25[g]*100%)/mr I*mr;
5mr=2500 II 5;
mr=500[g].
mw=mr-ms=500[g]-25[g]=475[g] H2O.
Odp.Należy dolać 475[g] wody.
x-95%
x=475g