Предмет: Физика, автор: loh7dtf75f5tuci

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2. Скільки енергіі потрібно для повного розплавлення і перетворення в ПАР шматка льоду 2,5 кг, взятого за температури -20С ( питома теплоємність льоду 2100 Дж/кг*С, теплота плавлення 340 Дж/кг, питома теплота пароутворення води 23 кДж/кг)

Ответы

Автор ответа: lvv9136
1

Ответ:

7,8 MДж

Объяснение:

m=2,5 кг;

T₁=-20 °C;

T₂=0 °C; ΔT₁=20 °C;

T₃=100 °C;  ΔT₂=100 °C;

c₁=2100 Дж/кг*°С;

c₂=4200 Дж/кг*°С;

λ=340 kДж/кг;

r=2,3 MДж/кг;

Q    ?     Q=m(c₁*ΔT₁+λ+c₂*ΔT₂+r)=

2,5*(2100*20+340000+4200*100+2300000)=7,8 MДж.

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