What is the volume of 4.9 mol of an ideal gas
at a pressure of 3 atm and a temperature of
0◦ C? 1 liter = 0.001 m^3
and 1 atm = 101300 Pascals. Answer in units of L.

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.