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Консультация № 201234
30.06.2021, 11:13
0.00 руб.
0
2
1
Здравствуйте! Прошу помощи в следующем вопросе:Фосфорная кислота, получаемая обработкой фосфата кальция серной кислотой, часто содержит примеси последней. Рассчитайте массовую долю серной кислоты в водном растворе, если известно, что соотношение числа атомов фосфора и серы равно 900:1, а число атомов кислорода в системе в 1,276
раза больше числа атомов водорода.
Ответ приведите в %
с точностью до десятых.
раза больше числа атомов водорода.
Ответ приведите в %
с точностью до десятых.
Обсуждение
01.07.2021, 19:22
общий
это ответ
Здравствуйте, kuznetsova.79!
Предлагаю Вам следующее решение задачи.
Дано:
-- отношение чисел атомов фосфора и серы в водном растворе; 
-- отношение чисел атомов кислорода и водорода в водном растворе.
Определить:
-- массовую долю серной кислоты в водном растворе.
Пусть в водном растворе содержатся
молекул серной кислоты, 
молекул фосфорной кислоты и 
молекул воды. Тогда в этом растворе содержатся 
атомов водорода, 
атомов серы, 
атомов фосфора, 
атомов кислорода. Согласно условию задачи,
Отсюда получим, что
то есть на
молекулу воды приходятся 
молекулы серной кислоты и 
молекул фосфорной кислоты. Учитывая, что молярная масса воды составляет 
(г/моль), молярная масса серной кислоты -- 
(г/моль), молярная масса фосфорной кислоты -- 
(г/моль), на 
(г) воды приходятся 
г серной кислоты и 
(г) фосфорной кислоты. При этом массовая доля серной кислоты в растворе составляет
или приблизительно 
Ответ:
Предлагаю Вам следующее решение задачи.
Дано:
-- отношение чисел атомов фосфора и серы в водном растворе; -- отношение чисел атомов кислорода и водорода в водном растворе.Определить:
-- массовую долю серной кислоты в водном растворе.Решение
Пусть в водном растворе содержатся
молекул серной кислоты, молекул фосфорной кислоты и молекул воды. Тогда в этом растворе содержатся атомов водорода, атомов серы, атомов фосфора, атомов кислорода. Согласно условию задачи,Отсюда получим, что
то есть на
молекулу воды приходятся молекулы серной кислоты и молекул фосфорной кислоты. Учитывая, что молярная масса воды составляет (г/моль), молярная масса серной кислоты -- (г/моль), молярная масса фосфорной кислоты -- (г/моль), на (г) воды приходятся г серной кислоты и (г) фосфорной кислоты. При этом массовая доля серной кислоты в растворе составляет или приблизительно Ответ:
5
Об авторе:
Facta loquuntur.
Facta loquuntur.
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