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@Trifoov
July 2022
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Вычислите массовые доли элементов в сульфате натрия Na2So4
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Estanislao
Na2SO4 Mr=142 ( 23×2+32+16×4) (46/142=(w)Na2)(w)Na2=0,32×100=32%(w)S=0,22×100=22%(w)O4=0,45×100=45%
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