a) What amount of heat per unit mass must be removed from water at 0°C to change

Question

a) What amount of heat per unit mass must be removed from water at 0°C to change it back to ice?
b) In a heat of fusion of ice experiment, why is the temperature of the water initially raised above room temperature? a) What amount of heat per unit mass must be removed from water at 0°C to change it back to ice?
b) In a heat of fusion of ice experiment, why is the temperature of the water initially raised above room temperature? a) What amount of heat per unit mass must be removed from water at 0°C to change it back to ice?
b) In a heat of fusion of ice experiment, why is the temperature of the water initially raised above room temperature?

Explanation / Answer

Q =mLf

Q/m = Lf ( latent heat of fusion) = 3.3 x 10^5 J/kg

part b )

The advantage of having the room temperature approximately halfway between the initial temperature of the water

and the final temperature of the water was so that the heat lost by the calorimeter and its contents to the

surroundings (when their temperature is above room temperature) is equal to the heat gained by the calorimeter and

its contents (when their temperature is below room temperature). i.e. the heat lost to surroundings is approximately

equal to the heat gained

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