Найти массу воды и соли необходимую для приготовления 200г раствора с w(соли)=0,25 1. CaO+H2O=
2. Ca+H2O=
3. Au+H2O=
4. CO2+H2O=
5. Fe2O3+H2O=
6. Na2O+H2O=
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