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A batch of 20 tons of liquid copper is to be cooled from 1200°C to 1150°C...

A batch of 20 tons of liquid copper is to be cooled from 1200°C to 1150°C by adding solid copper at 25°C. During the time it takes to make the addition and the temperature to stabilize, 40,000 kJ of heat is lost. What quantity of solid copper (in kg) shall be used?

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