help please!

2. n-propane is fed to the intake lines, and air is added to keep the decane concentration. The n-propane gas leaving the water seal is at a concentration of 1.5%, and the exit gas is saturated with water (at 293.0K ). The pressure of the gas leaving the water seal is 120.0kPa. How many the volumetric flow rate (m3/min) of air at 293.0K and 100.0kPa must be drawn through the system by the burner if the joint leakage from an oil tank car is 0.300 liter /min at 293.0K and 100.0kPa ? Ans: volumetric flow rate =1.93102m3/min