64 lb oxygen undergoes a constant pressure process in a closed system from state 1 at 42.33 atm, 444.8 r to state 2 at 42.33 atm, and 1600 r. the process discharges an amount of energy by heat transfer of 53,440.79 btu. determine: a. the molar volume of the gas at the state 1 and state 2 in ft3/lbmol b. the work of the process in btu c. the specific internal energy (molar basic) of the gas at state 1 in btu/lbmol