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A 50 g ice cube floats in 185 g of water in a 100 g copper cup; all are at a temperature of 0C. A piece of lead at 98C is dropped into the cup, and...

A 50 g ice cube floats in 185 g of water in a 100 g copper cup; all are at a temperature of 0°C. A piece of lead at 98°C is dropped into the cup, and the final equilibrium temperature is 12°C. What is the mass of the lead?

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