Q4 A stream of air flowing at a rate of 10 kg/h at STP (1 mol = 22.4 m? (STP)/kmol) is mixed with a stream of methane gas to produce one mixture stream in the outlet. The methane enters the mixer at a rate of 20 m/hr at 150C and 1.5 bar. (MWar = 29 kg/kmol) (a) Draw and label completely the diagram of the process. (5 marks) Calculate the volumetric flow rate (m/hr) of the gas mixture in the outlet stream. (10 marks) (c) Calculate the molar composition of the mixture in the outlet stream. (10 marks) (b)