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An aluminum cup contains 218 g of water at 21.5 C. A 412g sample of silver...

An aluminum cup contains 218 g of water at 21.5 C. A 412g sample of silver at an initial temperature of 81.6 C is placed in the water. A 40.2 g copper stirrer is used to stir the mixture until it reaches its final equilibrium temperature of 27.0 C. Calculate the mass of the aluminum cup.

I have posted this twice before and Ion capa told me there answers of 24.29 and 30.3 were incorrect. Third times the charm

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