Streams A and B are mixed adiabatically to produce stream C. Stream A is at 1 bar, 50 °C, it contains pure methane and its flow rate is 0.2 mol/min. Stream B is at 1 bar, 100 °C, contains a methane-ethane mixture 50% in methane (by mol) and its flow rate is 0.8 mol/min. Stream C exits at 1 bar.

a) What is the composition in the final mixture? 

b) What is the temperature and pressure at the end of the process? 

c) Calculate the entropy generation. 

d) What is the change in the total Gibbs energy of the system? 

e) How much work is needed to separate the final stream into the two streams we had before mixing, at their respective temperature and pressure? Assume that the temperature of the surroundings is 20 °C. 

f) What is the irreversible feature of this process?

Additional data: The ideal-gas C_P’s of the pure components are: ethane: 10.3 R; methane: 6.2 R; where R is the ideal-gas constant.