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Консультация № 196885
30.10.2019, 19:35
0.00 руб.
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Здравствуйте! У меня возникли сложности с таким вопросом:
Здравствуйте, помогите пожалуйста с решением следующей задачи
Необходимо рассчитать в при каких условиях и в каких пределах должна измениться энергия активации,чтобы соответствовать правилу Вант-Гоффа при температуре 298 k.
Заранее благодарю
Здравствуйте, помогите пожалуйста с решением следующей задачи
Необходимо рассчитать в при каких условиях и в каких пределах должна измениться энергия активации,чтобы соответствовать правилу Вант-Гоффа при температуре 298 k.
Заранее благодарю
Прикрепленные файлы:
Обсуждение
31.10.2019, 00:13
общий
это ответ
Здравствуйте, dasha238567!
Согласно правилу Вант-Гоффа при изменении температуры скорости реакций относятся как
kT+[$916$]T/kT=[$947$][$916$]T/10[i]К[/i], где [$947$] - число от 2 до 4
Согдасно уавнению Аррениуса
k=Ae-Ea/RT
или
kT+[$916$]T/kT=e(Ea/R)(1/T-1/(T+[$916$]T))
Приравниваем и логарифмируем
ln[$947$][$183$][$916$]T/10К=Ea[$916$]T/(RT(T+[$916$]T))
ln[$947$]/10К=Ea/(RT(T+[$916$]T))
принимая [$916$]T<<T и T+[$916$]T[$8776$]Т, упрощаем
ln[$947$]/10К=Ea/RT2
Ea=RT2/10К[$183$]ln[$947$]=8,314Дж/(моль[$183$]К)[$183$](298К)2/10К[$183$]ln[$947$]=74кДж/моль[$183$]ln[$947$]
Подставляя значения [$947$] от 2 до 4 получаем Ea от 51 кДж/моль до 102 кДж/моль (а значению [$947$]=3 соответствует Ea=81 кДж/моль)
Согласно правилу Вант-Гоффа при изменении температуры скорости реакций относятся как
kT+[$916$]T/kT=[$947$][$916$]T/10[i]К[/i], где [$947$] - число от 2 до 4
Согдасно уавнению Аррениуса
k=Ae-Ea/RT
или
kT+[$916$]T/kT=e(Ea/R)(1/T-1/(T+[$916$]T))
Приравниваем и логарифмируем
ln[$947$][$183$][$916$]T/10К=Ea[$916$]T/(RT(T+[$916$]T))
ln[$947$]/10К=Ea/(RT(T+[$916$]T))
принимая [$916$]T<<T и T+[$916$]T[$8776$]Т, упрощаем
ln[$947$]/10К=Ea/RT2
Ea=RT2/10К[$183$]ln[$947$]=8,314Дж/(моль[$183$]К)[$183$](298К)2/10К[$183$]ln[$947$]=74кДж/моль[$183$]ln[$947$]
Подставляя значения [$947$] от 2 до 4 получаем Ea от 51 кДж/моль до 102 кДж/моль (а значению [$947$]=3 соответствует Ea=81 кДж/моль)
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