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Hot tea (water) of mass 0.25 kg and temperature 73 C is contained in a glass of mass 200 g that is initially at the

Hot tea (water) of mass 0.25 kg and temperature 73 C is contained in a glass of mass 200 g that is initially at the same temperature. You cool the tea by dropping in ice cubes out of the freezer that are at a temperature of - 9 C. What is the minimum amount of ice in you need to make ice tea (final temperature of 0C)? 

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