Question

What was the mass of water used if 249 g of a copper ball, initially at 314°C was immersed into the water and allowed to mix until thermal equilibrium was reached at 38.8°C?  The specific heat of water is 4.184 J g ° C and that of copper is 0.387 J g ° C.  The initial temperature of the water was 22.6°C.

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