A 6.00 kgm piece of solid copper metal at an initial temperature To is placed with 2.00 kgm of ice that is initially at -20.0°C. The ice is in an insulated container of negligible mass and no heat is exchanged with the surroundings. After thermal equilibrium is reached, there is 1.20 kgm of ice and 0.80 kgm of liquid water. What was the initial temperature of the piece of copper?

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