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Консультация № 186500
06.08.2012, 01:37
0.00 руб.
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1
Здравствуйте, уважаемые эксперты! Прошу вас ответить на следующий вопрос:
Вычислите массовые доли изотопов 79Br и 81Br в броме, атомная масса которого равна 79,12.
Вычислите массовые доли изотопов 79Br и 81Br в броме, атомная масса которого равна 79,12.
Обсуждение
06.08.2012, 06:28
общий
это ответ
Здравствуйте, Massimo!
Обозначим массовую долю изотопа [sup]81[/sup]Br через x; соответственно массовая доля изотопа [sup]79[/sup]Br равна (1-x).
Тогда: x*81 + (1-x)*79 = 79.12 (1). Решив относительно x и приведя подобные:
x*2 = 0.12 (2), откуда x = 0.06 и (1-x) = 0.94.
Проверка: 0.06*81 + 0.94*79 = 79.12.
Ответ: Массовые доли изотопов [sup]79[/sup]Br и [sup]81[/sup]Br в броме, атомная масса которого равна 79.12, составляют 0.94 и 0.06 или 94% и 6% соответственно.
Обозначим массовую долю изотопа [sup]81[/sup]Br через x; соответственно массовая доля изотопа [sup]79[/sup]Br равна (1-x).
Тогда: x*81 + (1-x)*79 = 79.12 (1). Решив относительно x и приведя подобные:
x*2 = 0.12 (2), откуда x = 0.06 и (1-x) = 0.94.
Проверка: 0.06*81 + 0.94*79 = 79.12.
Ответ: Массовые доли изотопов [sup]79[/sup]Br и [sup]81[/sup]Br в броме, атомная масса которого равна 79.12, составляют 0.94 и 0.06 или 94% и 6% соответственно.
5
Большое спасибо!!!
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