Three kg of helium gas at 100 kpa and 27°c are adiabatically compressed to 900 kpa. if the isentropic compression efficiency is 65 percent, determine the required work input and the final temperature of helium. use data from tables.

10 kg of co2 is initially contained at 400 kpa and 300 k. the gas constant for carbon dioxide is 189 j/lkg k) and has a specific heat ratio, k, of 1.289. isentropic expansion then occurs until the pressure is 200 kpa. a) determine the initial volume of co2 in m. b) determine the final temperature in k. c) determine the work done by the system during the expansion kl.