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0.45kg mass of liquid mercury initially 400°C is placed in an insulating closed container. The lid...

0.45kg mass of liquid mercury initially 400°C is placed in an insulating closed container. The lid of the container is briefly lifted to insert a mass of copper initially at 490°C, causing all of the liquid mercury to undergo a phase change. What mass of copper was added if the system thermalizes at the boiling point of mercury?

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