The product gas from a coal gasification plant consists of 60.0 mole% CO and the balance H2 it leaves the plant at 150°C and 2000psia. The gas expands through a turbine, and the outlet gas from the turbine is fed to a boiler furnace at 100°C and 1 atm at a rate of 15,000 ft3/min. Estimate the inlet flow rate to the turbine in ft3lmin, using Kay’s rule. What percentage error would result from the use of the ideal gas equation of state at the turbine inlet?