What is the ionization fraction of hi at a depth where t= 9000 k and p= 140 dyn/cm2 in a star composed of pure hydrogen (assume ui= 2)? the right answer should be 0.446.

Air is contained in a variable-load piston-cylinder device equipped with a paddle wheel. initially, air is at 400 kpa and 17°c. the paddle wheel is now turned by an external electric motor until 75 kj/kg of work has been transferred to air. during this process, heat is transferred to maintain a constant air temperature while allowing the gas volume to triple. calculate the required amount of heat transfer in kj/kg.