m(соли)=500г*0,25=125г
m(h2o)=500-125=375г
w(соли)=(125+25):(500+25)=0,2857
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m(соли)=500г*0,25=125г
m(h2o)=500-125=375г
w(соли)=(125+25):(500+25)=0,2857