July 2021 1 7 Report
Помогите решить задачи по химии !!!!!!

1) Вычислить массу соли и воды которые необходимы для приготовления 280 грамм 25% раствора.

2) В 220 воды растворили 15 грамм щелочи. Найти массовую долю щелочи в растворе.
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