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Консультация № 184644
01.12.2011, 21:34
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Здравствуйте! У меня возникли сложности с таким вопросом:
В составе имеется 63,22%марганца и 36,78% кислорода. Найдите формулу?
В составе имеется 63,22%марганца и 36,78% кислорода. Найдите формулу?
Обсуждение
Неизвестный
01.12.2011, 21:36
общий
Адресаты:
Роман!!! Помогите пожалуйста!!!!! Завтра доча пойдет в школу, а я вообще не шарю в химии
Неизвестный
01.12.2011, 22:32
общий
это ответ
Здравствуйте, Ирина!
Решаем так:
M(Mn) = 55 г/моль, M(O) = 16 г/моль. Формула оксида MnxOy. 55x/0.6322 = 16y/0.3678 = M(MnxOy)
Считаем. 87x = 43.5y. 2x = y. Т.е. формула упрощается до MnO2. Это и есть формула искомого оксида.
С уважением, Товарищ Бородин
Решаем так:
M(Mn) = 55 г/моль, M(O) = 16 г/моль. Формула оксида MnxOy. 55x/0.6322 = 16y/0.3678 = M(MnxOy)
Считаем. 87x = 43.5y. 2x = y. Т.е. формула упрощается до MnO2. Это и есть формула искомого оксида.
С уважением, Товарищ Бородин
Неизвестный
01.12.2011, 22:35
общий
это ответ
Здравствуйте, Ирина!
Пусть m (MnxOy)=100 г, тогда
m(Mn)= 63,22 г
m(O)= 36,78 г
x=n(Mn)= m(Mn)/M(Mn)= 63,22 г/55 г/моль=1,15 моль
y = n(O)= m(O)/M(O)= 36,78 г/16 г/моль=2,29 моль
x : y = n(Mn) : n(O)=1,15 : 2,29 (наименьшее из них 1,15, значит делим каждое число на 1,15)
x : y = 1: 1,9= 1:2
MnO2 - оксид марганца (IV)
Пусть m (MnxOy)=100 г, тогда
m(Mn)= 63,22 г
m(O)= 36,78 г
x=n(Mn)= m(Mn)/M(Mn)= 63,22 г/55 г/моль=1,15 моль
y = n(O)= m(O)/M(O)= 36,78 г/16 г/моль=2,29 моль
x : y = n(Mn) : n(O)=1,15 : 2,29 (наименьшее из них 1,15, значит делим каждое число на 1,15)
x : y = 1: 1,9= 1:2
MnO2 - оксид марганца (IV)
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