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Консультация № 194740
20.02.2019, 13:50
0.00 руб.
21.02.2019, 00:39
1
1
1
Здравствуйте, уважаемые эксперты! Прошу вас ответить на следующий вопрос:
Решить задачу.
В реакции аммиачного раствора оксида серебра (I) с альдегидом массой 20,3 г получили серебро массой 75,6 г.
Определите молекулярную формулу и составьте структурную формулу альдегида.
Решить задачу.
В реакции аммиачного раствора оксида серебра (I) с альдегидом массой 20,3 г получили серебро массой 75,6 г.
Определите молекулярную формулу и составьте структурную формулу альдегида.
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Обсуждение
21.02.2019, 01:04
общий
это ответ
Здравствуйте, svrvsvrv!
R-CHO + 2[Ag(NH3)2]OH = R-COOH + 2Ag[$8595$] + 4NH3 + H2O
nAg=75,6г/108г/моль=0,7 моль
nR-CHO=0,35 моль
MR-CHO=20,3г/0,35моль= 58 г/моль
При общей формуле альдегида CnH2nO имеем
14n+16=58
откуда n=3, и формула вещества C3H6O
Единственный альдегид, соответствующий этой формуле - пропаналь CH3-CH2-CHO
R-CHO + 2[Ag(NH3)2]OH = R-COOH + 2Ag[$8595$] + 4NH3 + H2O
nAg=75,6г/108г/моль=0,7 моль
nR-CHO=0,35 моль
MR-CHO=20,3г/0,35моль= 58 г/моль
При общей формуле альдегида CnH2nO имеем
14n+16=58
откуда n=3, и формула вещества C3H6O
Единственный альдегид, соответствующий этой формуле - пропаналь CH3-CH2-CHO
5
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