Question

It takes 1 kcal to raise the temperature of 1 kg of liquid water by 1 C, but only 0.5 kcal to raise the temperature of 1 kg of ice or water vapor by 1 C. Also, it takes 80 kcal to melt 1 kg of ice sitting at 0 C, and 540 kcal to evaporate 1 kg of liquid water sitting at 100 C.

1) How much heat is required to melt 2 kg of ice at 0 C?

(60 kcal / 120 kcal / 160 kcal / 1080 kcal)

2) How much heat is required to raise the temperature of 2 kg of liquid water by 60 C?

(60 kcal / 120 kcal / 160 kcal / 1080 kcal)

3) How much heat is required to evaporate 2 kg of liquid water at 100 C?

(60 kcal / 120 kcal / 160 kcal / 1080 kcal)

Answer 1