Какую массу воды надо взять,чтобы приготовить 85г 20%-ного раствора соли? 1) 80г 2) 49г 3) 65г 4) 68г
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13.05.2019 18:54
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m(соли)=85*20%/100%=17 г
m(H2O)= 85-17=68 г