4compute the volume percent of graphite vgr in a 3.5 wt% c cast iron, assuming that all the carbon exists as the graphite phase. assume densities of 7.9 and 2.3 g/cm3 for ferrite and graphite, respectively.

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.