(10 points) a rigid, well-insulated 10 m3 container contains the following gases in the indicated mass fractions: n2 (15%), he (5%), ch4 (60%), c2h6 (20%). the mixture is initially at 0.2 mpa and 293 k, then a paddle installed in the chamber spins at a rate and for a period of time to do 100 kj of work on the gas mixture. determine the final pressure and temperature, assuming the gases can be treated as ideal gases with constant specific heats.
