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Консультация № 196377
16.09.2019, 12:40
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Бор представляет собой смесь двух стабильных изотопов.
Используя значения атомной массы бора и атомной массы одного
из изотопов, вычислить атомную массу второго изотопа.
Используя значения атомной массы бора и атомной массы одного
из изотопов, вычислить атомную массу второго изотопа.
Обсуждение
17.09.2019, 12:00
общий
это ответ
Здравствуйте, 1qaz2wsx!
Атомная масса A бора связана с атомными массами A1, A2 и массовыми долями w1, w2 его изотопов формулой
откуда, например, следует, что
Примем, что A1=10,012937 а. е. м., w1=0,199, w2=0,801 [1, с. 156]; A=10,81 а. е. м. (по таблице на форзаце [2]). Тогда
Литература
1. Физическая химия -- 1. Сборник задач. / Л. Ф. Крылова и др. -- Новосибирск: РИЦ НГУ, 2014. -- 169 с.
2. Фролов В. В. Химия. -- М.: Высшая школа, 1986. -- 543 с.
Атомная масса A бора связана с атомными массами A1, A2 и массовыми долями w1, w2 его изотопов формулой
A=A1w1+A2w2,
откуда, например, следует, что
A2=(A-A1w1)/w2.
Примем, что A1=10,012937 а. е. м., w1=0,199, w2=0,801 [1, с. 156]; A=10,81 а. е. м. (по таблице на форзаце [2]). Тогда
A2[$8776$](10,81-10,013*0,199)/0,801[$8776$]11,01 (а. е. м.).
Литература
1. Физическая химия -- 1. Сборник задач. / Л. Ф. Крылова и др. -- Новосибирск: РИЦ НГУ, 2014. -- 169 с.
2. Фролов В. В. Химия. -- М.: Высшая школа, 1986. -- 543 с.
Об авторе:
Facta loquuntur.
Facta loquuntur.
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