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Здравствуйте, тов. эксперты! Помогите решить 2 задачи! 1. Какая масса 1-бромпропана потребуется для получения путем ряда превращений 29 г. ацетона, если выход всех реакций 100% 2. Через раствор, содержащий 44,56 г. воды и муравьиной и уксусной кислоты массой 5.44 г., пропустили оксид свинца (II) массой 22,3 г. Смесь отфильтровали, остаток пропустили через 12,8 мл 8M раствора азотной кислоты. Определить массовую долю кислот в растворе. Задачи сложные, никто решить не может, вся надежда на вас :-)
Обсуждение
Неизвестный
18.10.2007, 11:02
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это ответ
Здравствуйте, Virust00! 1. Для ответа на данный вопрос не нужно писать реакций - достаточно написать формулы 1-бромпропана и ацетона: 1-бромпропан Br-CH<sub>2</sub>CH<sub>2</sub>CH<sub>3</sub> ацетон CH<sub>3</sub>COCH<sub>3</sub>, как станет очевидно, что из одного моля 1-бромпропана можно получить при выходе промежуточных реакций 100% 1 моль ацетона => 29 г ацетона равносильно 0.5 моль => нужно 0.5 моль 1-бромпропана или 61.5 г. 2. Составим уравнения реакций: PbO + 2CH<sub>3</sub>COOH = Pb(CH<sub>3</sub>COO)<sub>2</sub> + 2H<sub>2</sub>O PbO + 2HCOOH = Pb(HCOO)<sub>2</sub> + 2H<sub>2</sub>O PbO + 2HNO<sub>3</sub> = Pb(NO<sub>3</sub>)<sub>2</sub> + 2H<sub>2</sub>O Количество оксида свинца равно 22.3 г/223 г/моль = 0.1 моль. Согласно уравнениям реакций суммарное количество кислот вдвое больше и равно 0.2 моль. Исходя из этого можно составить систему уравнений:
46x + 60y = 5.44 x + y + 0.0128 * 8 = 0.2, где x - количество муравьиной кислоты, а y - количество уксусной кислоты, 5.44 - их суммарная масса, 0.2 - 0.0128 * 8 = 0.0976 моль - их суммарное количество.
x = 0.0976 - y 46*(0.0976 - y) + 60y = 5.44 4.49 - 46y + 60y = 5.44 14y = 0.95 y = 0.0679 моль x = 0.0976 - 0.0679 = 0.0297 моль Масса муравьиной кислоты равна m = 0.0297 * 46 = 1.366 г, масса уксусной кислоты равна 0.0679 * 60 = 4.074 г. Массовые доли: муравьиной кислоты = 1.366/50 * 100% = 2.7%, уксусной кислоты = 4.074/50 * 100% = 8.1%
Прим. 50 г = суммарная масса раствора.
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