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A piece of copper at 260?C is dropped into 1.6kgof water at 17?C . Part A...

A piece of copper at 260?C is dropped into 1.6kgof water at 17?C .

Part A

If the equilibrium temperature is 22?C , what is the mass of the copper?

Express your answer using two significant figures.
mCu = kg

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Answer #1

let mCu be the mass of copper. Use the law of

conserving energy to find the mass of the copper.

        (1600 g)(4.2)(22-17) = mCu(0.39)(260-22)

                              mCu = 361.99 grams

                               = 0.36 kg

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Answer #2

Let us suppose the mass of copper piece is

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