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What is the specific heat of tin if a mixture of 100.0 g of Cu at...

What is the specific heat of tin if a mixture of 100.0 g of Cu at 10.0°C and 200.0 g of Sn at 120.0°C reach thermal equilibrium at a temperature of 69.0°C? The specific heat of copper is 0.38 J/(g·°C).

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