Q569
How much mechanical work must be done to completely melt 1 gram of ice at 0°C ?
A.
4.2 J
B.
80 J
AnswerC.
336 J
D.
2268 J
Answer: Option B
Solution
Answer: Option B
Solution:
It takes 80 calories to melt 1 gram of ice. If 1 g of ice (at 0 degrees Celsius) is given 80 calories, it will melt and the final temperature of the water will be 0. Freezing water at 0 degrees Celsius: It also takes 80 calories to freeze 1 gram of water.