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Вот такой вот я не успевающий, на работе все время дергают.. хотя сейчас сессия.. в химии так то разбираюсь, но абсолютно нет времени.. Контрольную здавать после завтра.. прошу помощи.. Да.. стыдно мне :-(
3. К 3 л раствора азотной кислоты с массовой долей HNO3 10% и плотностью 1,054 г/мл прибавили 5 л раствора азотной кислоты с массовой долей HNO3 2% и плотностью 1,009 г/мл. Вычислите массовую долю HNO3 и молярную концентрацию в полученном растворе, объем которого 8 л.
24. При какой температуре наступит равновесие в системе 4HCl(г.) + O2(г.) -> 2H2O(г.) + 2Cl2(г.) ; deltaH = -114,42 кДж?
45. На основании электронных уравнений расставьте коэффициенты в уравнении реакции, идущей по схеме: Na2SO3 + H2O + KMnO4 -> KOH + Na2SO4 + MnO2 . Составьте электронные уравнения и укажите, какой процесс - окисления или восстановления происходит. S^2-->S^0, As^3--> As^5+, N^3+-> N^3-.
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Неизвестный
05.02.2009, 19:41
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это ответ
Здравствуйте, Степанов Андрей Сергеевич! 3. Вычислим массу полученного раствора: m = 3 л * 1054 г/л + 5 л * 1009 г/л = 8207 г. Теперь найдем массу "чистой" азотной кислоты: mHNO3 = 3 л * 1054 г/л *0.1 + 5 л * 1009 г/л * 0.02 = 417.1 г. Массовая доля азотной кислоты в полученном растворе: [$969$] = 417.1 г / 8207 г * 100% = 5.1%. Молярная концентрация: C = (417.1 г/63 г/моль)/8 л = 0.83 моль/л.
24. Равновесие в системе может наступать при любой температуре. Вопрос задачи сформулирован некорректно. Здесь имеется в виду температура, выше которой самопроизвольное протекание невозможно.
Для нахождения такой температуры найдем изменение энтропии реакции. [$916$]S[$186$] = 2*S[$186$](H2O(г.)) + 2 * S[$186$](Cl2) - 4*S[$186$](HCl) - S[$186$](O2) = 2 * 188.7 + 2 * 222.96 - 4 * 186.69 - 205.04 = -128.48 Дж/(моль * К). А теперь поделим изменение энтальпии на изменение энтропии и получим температуру: T = -114420 / (-128.48) = 891 K. ЗЫ рекомендую проверить вычисление изменения энтропии самостоятельно. Когда умножал в уме 4 * 186.69, мог совершить ошибку.
Задача без номера. S2- - 2e = S0 - окисление(так как от атома в его начальном состоянии электроны отнимаются) As3- - 8e = As5+ - окисление. N3+ + 6e = N3- - восстановление.
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