A tank has a volume of 500 liters and is initially full of a liquid that is at 300 K, has a density of 0.8 kg/L, and a constant heat capacity of C _V = 3 J/g · K. The tank can be modeled as perfectly insulated, and its contents can be assumed to be well mixed, although the shaft work added by the mixer can be considered negligible. The inlet and outlet valves are both opened at the same time. The flow rates of the entering and leaving liquids are both 25 L/min. The entering liquid is at T = 400 K, and the temperature of the exiting liquid at any time is identical to the temperature of the liquid in the tank at that particular time (Figure 3-14). After five minutes, what is the temperature of the liquid in the tank?