Having some troubles with this problem involving Cp^ig0.1 mol/s of carbon dioxide (CO2) enters a heat exchanger in steady flow at 221.5 bars and 650 K.  It exits the heat exchanger at 350 K with negligible change in pressure. Determine the rate (J/s) at which heat must be removed from the CO2 in the heat exchanger:

(a)  assuming CO2 behaves as an ideal gas.

(b)  assuming CO2 follows the principle of corresponding states.

(c)  assuming CO2 follows the van der Waals fluid.