During carbon equetration, a proce i to be deigned in which CO2 flow through a duct at high preure; a thermometer in the duct read 200 K. A mall amount of ga i bled out of thi duct through an inulated throttle valve open to the atmophere. The temperature of the ga leaving the throttle i meaured at 180 K. What i the entropy change a the ga leave the throttling valve? The ga obey the following equation of tate: PV/RT = 1 bP/RT; b = 20 cc/mol, R = 8. 314 J/mol K The contant preure heat capacity of the ga i 10 cal/mol K and can be aumed to be independent of temperature and preure
