[Solved] How much mechanical work must be done to completely melt 1 gram of ice at 0°C?

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Q.	How much mechanical work must be done to completely melt 1 gram of ice at 0°C?
A.	4.2 J
B.	80 J
C.	336 J
D.	2268 J
Answer» B. 80 J
Explanation: When water at 0 degree Celsius freezes, each gram of water gives off 80 calories. The temperature of the water stays at 0 degree C until every drop has frozen. When ice at 0 degree Celsius melts, it absorbs an equal amount of heat-80 calories for each gram of ice—and its temperature remains unchanged until it has completely melted.

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