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Question

A 5 g piece of ice at - 20C is put into 10g of water at 30C. Assuming that heat is exchanged only between the ice and the water, find the final temperature of the mixture.

A
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B
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C
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D
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Solution

The correct option is A
Specific heat capacity of ice = 2100 J/kgC,
Specific heat capacity of water = 4200 J/kgC Latent heat of fusion of ice = 3.36×105 J/kg.
The heat given by the water when it cools down from 30C to 0C is
(0.01 kg)(2100 J/kgC)(20C)=210J
The heat required to melt 5 g of ice is
(0.005 kg)(3.36×105 J/kg)=1680J
We see that whole of the ice cannot be melted as the required amount of heat is not provided by the water. Also, the heat is enough to bring the ice to 0C. Thus the final temperature of the mixture is 0C with some of the ice melted.

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