A 38-kg copper block initially at 140C is dropped into an insulated tank that contains 90 L of water at 10C. Determine the final equilibrium temperature and the total entropy change for this process. The specific heat of water at 25C is cp = 4.18 kJ/kg.K. The density of water is 997 kg/m. The specific heat of copper at 27C is cp = 0.386 kJ/kgK. 90 L Copper Water The final equilibrium temperature is 287.893 K. The total entropy change during this process is 6.924 KJ/K.