a is 5

b is 6

d is 7

e is 8

An engineer claims to have invented a steady-flow device that will take air at 4 bar and at a certain constant temperature and separate it into two streams of equal molar flow rates, one at 1 bar and 20C and the second one at 1 bar and " ab " C. Furthermore, the inventor states that his device operates adiabatically and does not require (or produce) any work. If such a device is possible, determine the total work lost at an ambient temperature of "de" C for an inlet molar flow rate of " a " mol/s. Air can be assumed to be an ideal gas with a constant heat capacity of cp=29.3J/(molK)