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какую массу воды надо выпарить из 150г раствора с массовой доле соли 10%. чтобы получить раствор с массовой долей 20%?
1)75г
2)100г
3) 50г
4) 25г-
Предмет:
Химия -
Автор:
estherscze - 5 лет назад
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Ответы 1
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m(вещества)=150*0,1=15 гm(раствора)=15:0,2=75 гm(воды)=150-75=75 г1)75 г
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Автор:
cujo - 5 лет назад
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Eleanor Roosevelt was one of America’s great reforming leaders, who had a big impact on national policy toward youth, the black, women, and the poor. She worked hard to improve housing, education, health, and the status of minority groups. As the wife of the 32nd President of the United States Franklin D. Roosevelt, she was the country’s most active First lady.
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