The dry stack gas of an electrical-generation station boiler has the following Orsat analysis: 15 percent O2, 15 percent CO2, and 1 percent CO. This gas passes through a 10-square-foot cross-section metering duct at a velocity of 20 ft/s at standard atmospheric pressure and 200°F. Determine the gas mixture's mass flow rate. The universal gas constant is R = 10.73 psiaft3/lbmol°R. Use the table containing the molar mass, gas constant, and critical-point properties.

What is the mass flow rate of the gas mixture?

a) 125 lbm/s
b) 130 lbm/s
c) 135 lbm/s
d) 140 lbm/s