A 31 kg block of copper at a temperature of 72 c is dropped, Ask an Expert

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A 3.1 kg block of copper at a temperature of 72 C is dropped into a bucket containing a mixture of ice and water whose total mass is 1.2 kg. When thermal equilibrium is reached the temperature of the water is 8 C. How much ice was in the bucket before the copper block was placed in it? (Neglect the heat capacity of the bucket.)

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