Question

An ice bag containing 0°C ice is much more effective in absorbing heat than one containing the same amount of 0°C wat

of fusion is 79.8 kcal/kg.

(a) How much heat in kcal is required to raise the temperature of 0.780 kg of water from 0°C to 23.0°C?

(b) How much heat is required to first melt 0.780 kg of 0°C ice and then raise its temperature to 23.0°C?

Answer 1

Cooling takes place when heat is removed from the system. In case of ice at 0oC; it will take (latent heat) from the medium to convert itself into water at 0oC and then water at high temperature. So ice(0oC) is more effective in cooling than water at 0oC.