m(в-ва)=500г*0.05=25г
m(в-ва)=25г
m(H2O)=500г-25г=475г
v(H2O)=475мл
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m(в-ва)=500г*0.05=25г
m(в-ва)=25г
m(H2O)=500г-25г=475г
v(H2O)=475мл