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An aluminum cup contains 235 g of water and a 43-g copper stirrer, all at 29C. A 409-g sample of silver at an initial temperature

An aluminum cup contains 235 g of water and a 43-g copper stirrer, all at 29C. A 409-g sample of silver at an initial temperature of 89C is placed in the water. The stirrer is used to stir the mixture gently until it reaches its final equilibrium temperature of 35C. Calculate the mass of the aluminum cup. 

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