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Консультация № 177485
27.03.2010, 11:50
43.11 руб.
0
3
1
Доброго времени,никак не могу решить...
Определите эквивалент металла, если из 21,5г его гидроксида может быть получено 5,7г металла.
Спасибо.
Определите эквивалент металла, если из 21,5г его гидроксида может быть получено 5,7г металла.
Спасибо.
Обсуждение
Неизвестный
27.03.2010, 12:54
общий
это ответ
Здравствуйте, Матвеев Денис Александрович.
Для решения данной задачи воспользуемся законом эквивалентов: массы взаимодействующих веществ пропорциональны их эквивалентным массам
Кроме того эквивалент гидроксида равен сумме эквивалента металла и эквивалента гидроксильной группы: МЭ(гидроксида металла) = МЭ(гидроксильной группы) + МЭ(металла)
Обозначив эквивалент металла как Х и зная эквивалент гидроксильной группы 17 г, определим эквивалент гидроксида металла (Х+17) г
Составим пропорцию
Из 21,5 г гидроксида металла получается 5,7 г металла
Из (Х+17) г гидроксида металла -/- Х г металла
Х=5,7· (Х+17)/21,5
21,5Х = 5,7Х +96,9
Х = 6,13
Для решения данной задачи воспользуемся законом эквивалентов: массы взаимодействующих веществ пропорциональны их эквивалентным массам
Кроме того эквивалент гидроксида равен сумме эквивалента металла и эквивалента гидроксильной группы: МЭ(гидроксида металла) = МЭ(гидроксильной группы) + МЭ(металла)
Обозначив эквивалент металла как Х и зная эквивалент гидроксильной группы 17 г, определим эквивалент гидроксида металла (Х+17) г
Составим пропорцию
Из 21,5 г гидроксида металла получается 5,7 г металла
Из (Х+17) г гидроксида металла -/- Х г металла
Х=5,7· (Х+17)/21,5
21,5Х = 5,7Х +96,9
Х = 6,13
Неизвестный
28.03.2010, 06:31
общий
Эквивалентом вещества называется такое его количество, которое соединяется с 1 молем атомов (или ионов) водорода или замещает то же количество атомов водорода в химических реакциях. 17 г - моль эквивалента гидроксильной группы ОН (16+ 1) присоединяет 1 г ионов водорода.
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