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Консультация № 200300
20.02.2021, 18:55
0.00 руб.
0
1
1
Здравствуйте, уважаемые эксперты! Прошу вас ответить на следующий вопрос: 1) Сколько теплоты выделится из 0,5 л воды температурой 0[$176$]С, поставленной в холодильник, до того, как она полностью замерзнет?
2) Сколько льда температурой 0[$176$]С можно расплавить энергией, необходимой для доведения до кипения 1 л воды такой же температуры?
3) Какое количество теплоты необходимо затратить для превращения в воду 3 кг льда, находящегося при температуре плавления?
2) Сколько льда температурой 0[$176$]С можно расплавить энергией, необходимой для доведения до кипения 1 л воды такой же температуры?
3) Какое количество теплоты необходимо затратить для превращения в воду 3 кг льда, находящегося при температуре плавления?
Обсуждение
23.02.2021, 00:19
общий
это ответ
Здравствуйте, Залина!
А. Количество теплоты, затрачиваемое при нагревании (выделяющееся при охлаждении) вещества массой m, с удельной теплоемкостью с, от температуры t1 до температуры t2
Q=cm(t2-t1) = cm[$916$]t (*)
Б. Количество теплоты, необходимое для плавления/выделяющееся при отвердевании вещества массой m, с удельной теплотой плавления [$955$], взятого при температуре плавления
Q=[$955$]m (**)
В. Связь массы m вещества с его плотностью [$961$] и объемом V
m=[$961$]V;
Табличные значения для воды/льда:
tплав=0[$186$]С
tкип=100[$186$]С
с=4200Дж/кг*[$186$]С
[$955$]=2,3*106Дж/кг
[$961$]=103кг/м3
Отсюда:
Вопрос 1
Q=[$955$]m=[$955$][$961$]V=2,3*106Дж/кг*103кг/м3*0,5*10-3м3=1,15*106 Дж
Вопрос 2
Q1=Q2
[$955$]m1=cm2[$916$]t
[$955$]m1=c[$961$]V2[$916$]t
[$8658$]
m1=c[$961$]V2[$916$]t/[$955$]=4200 Дж/кг*[$186$]С*103кг*100[$186$]С/м3*10-3м3/2,3*106Дж/кг[$8776$]0,183 кг
Вопрос 3
Q=[$955$]m = 2,3*106Дж/кг * 3кг = 6,9*106 Дж
А. Количество теплоты, затрачиваемое при нагревании (выделяющееся при охлаждении) вещества массой m, с удельной теплоемкостью с, от температуры t1 до температуры t2
Q=cm(t2-t1) = cm[$916$]t (*)
Б. Количество теплоты, необходимое для плавления/выделяющееся при отвердевании вещества массой m, с удельной теплотой плавления [$955$], взятого при температуре плавления
Q=[$955$]m (**)
В. Связь массы m вещества с его плотностью [$961$] и объемом V
m=[$961$]V;
Табличные значения для воды/льда:
tплав=0[$186$]С
tкип=100[$186$]С
с=4200Дж/кг*[$186$]С
[$955$]=2,3*106Дж/кг
[$961$]=103кг/м3
Отсюда:
Вопрос 1
Q=[$955$]m=[$955$][$961$]V=2,3*106Дж/кг*103кг/м3*0,5*10-3м3=1,15*106 Дж
Вопрос 2
Q1=Q2
[$955$]m1=cm2[$916$]t
[$955$]m1=c[$961$]V2[$916$]t
[$8658$]
m1=c[$961$]V2[$916$]t/[$955$]=4200 Дж/кг*[$186$]С*103кг*100[$186$]С/м3*10-3м3/2,3*106Дж/кг[$8776$]0,183 кг
Вопрос 3
Q=[$955$]m = 2,3*106Дж/кг * 3кг = 6,9*106 Дж
5
Об авторе:
С уважением
shvetski
С уважением
shvetski
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