A gas fuel of the following composition: 4.5% CO2, 26% CO, 13% H2, 0.5% CH4, and 56 % N, is burned with air. The combustion requires oxygen to be 10% in excess over the theoretical amount. The air contains 0.5% of water. If 500 m' (STP) of gas fuel are burned per hour, determine: a) The molar flow rate of the gas entering the system. b) The molar flow rate of the humid air. c) The molar flow rate of stack gas. d) The composition of the stack gas. e) The dew point of the stack gas