m(соли)= 500*20/100%=100г
m(Н2О)=500г-100г=400г
100gr (NaCl), 400gr (H2O)
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m(соли)= 500*20/100%=100г
m(Н2О)=500г-100г=400г
100gr (NaCl), 400gr (H2O)