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Консультация № 201286
23.07.2021, 14:42
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1
Здравствуйте! У меня возникли сложности с таким вопросом: Рассчитайте теоретическую плотность железа, если известно, что параметр элементарной ячейки равен 2,87 ?. Ответ приведите в г/см3 с точностью до десятых. 
Обсуждение
23.07.2021, 18:40
общий
это ответ
Здравствуйте, kuznetsova.79!
Предлагаю Вам такое решение задачи.
Дано:
А=
м -- параметр ячейки ОЦК-решётки железа.
Определить:
-- теоретическую плотность железа.
Опираясь на известное решение аналогичной задачи отсюда: Ссылка >>, выполним следующее.
Определим, сколько атомов железа приходится на одну ячейку ОЦК-решётки:
Вычислим объём одной ячейки:
(м3).
Вычислим массу одного атома жёлеза, зная, что один моль железа имеет массу приблизительно
кг и содержит приблизительно 
атомов: 
(кг).
Вычислим искомую плотность железа:
(кг/м3)
г/см3.
Ответ:
г/см3.
Предлагаю Вам такое решение задачи.
Дано:
А= м -- параметр ячейки ОЦК-решётки железа.Определить:
-- теоретическую плотность железа.Решение
Опираясь на известное решение аналогичной задачи отсюда: Ссылка >>, выполним следующее.
Определим, сколько атомов железа приходится на одну ячейку ОЦК-решётки:
Вычислим объём одной ячейки:
(м3).Вычислим массу одного атома жёлеза, зная, что один моль железа имеет массу приблизительно
кг и содержит приблизительно атомов: (кг).Вычислим искомую плотность железа:
(кг/м3) г/см3.Ответ:
г/см3.
5
Об авторе:
Facta loquuntur.
Facta loquuntur.
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