Carbon dioxide in a piston-‐‐cylinder is expanded in a polytropic manner. The initialtemperature and pressure are 400 K and 550
kPa. The polytropic exponent, n, is equalto 1.2. The final temperature (at the end of the expansion process) is 350 K. Determinethe heat transfer per kg in the process (i.e., in units of kJ/kg).