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Консультация № 145255
28.09.2008, 03:01
0.00 руб.
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1
Помогите решить.
Найти формулу кристаллогидрата хлорида бария, зная, что 36,6г соли при прокаливании теряют в массе 5,4г.
Ответ: BaCl2*2H2O
Найти формулу кристаллогидрата хлорида бария, зная, что 36,6г соли при прокаливании теряют в массе 5,4г.
Ответ: BaCl2*2H2O
Обсуждение
Неизвестный
28.09.2008, 08:57
общий
это ответ
Здравствуйте, Михаил Александрович!
Составим "уравнение обезвоживания":
BaCl2[$149$]nH2O = BaCl2 + nH2O
Теперь вот что... Количество воды, как видно из уравнения вдвое больше количества соли. Молярная масса исходной соли равна 137 + 71 + 18*т = 208 + 18n. Молярная масса воды 18. Уравниваем количества:
36.6/(208 + 18*n) = 5.4 / 18n
36.6 * 18n = (208 + 18*n) * 5.4
658.8n = 1123 + 97.2n
561.6n = 1123
n = 1.99964 = 2.
Формула кристаллогидрата: BaCl2[$149$]2H2O.
С уважением, Товарищ Бородин
Составим "уравнение обезвоживания":
BaCl2[$149$]nH2O = BaCl2 + nH2O
Теперь вот что... Количество воды, как видно из уравнения вдвое больше количества соли. Молярная масса исходной соли равна 137 + 71 + 18*т = 208 + 18n. Молярная масса воды 18. Уравниваем количества:
36.6/(208 + 18*n) = 5.4 / 18n
36.6 * 18n = (208 + 18*n) * 5.4
658.8n = 1123 + 97.2n
561.6n = 1123
n = 1.99964 = 2.
Формула кристаллогидрата: BaCl2[$149$]2H2O.
С уважением, Товарищ Бородин
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