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A 5 g piece of ice at −20°C is put into m kg of water at 30°C temperature. The heat is exchanged only between the ice and the water. The final temperature of the mixture is 0°C in liquid phase. What is the value of m in kg?

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A 5 g piece of ice at −20°C is put into m kg of water at 30°C temperature. The heat is exchanged only between the ice and the water. The final temperature of the mixture is 0°C in liquid phase. What is the value of m in kg?
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