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i <br /> Mass flow rate calculations are based on the ideal gas law <br /> PV = nRT <br /> P = pressure in absolute atmosphere <br /> V = volume in liter <br /> n = moles <br /> R = ideal gas constant, 0 0821 liter-atmosphere/mole-Kelvin <br /> T = temperature in Kelvin <br /> volume of air <br /> (24 0 ft3/min)(28 32 liter/ft3)(1 ,440 min/day) = 979,000 liter/day <br /> temperature of air <br /> 101 4 °C + 273 2 = 374 6 Kelvin <br /> pressure in exhaust stack = 1 atmosphere <br /> n = (1 atm)(979,000 Mer/day)/(O 0821 liter-atm/mole-Kelvin)(374 6 Kelvin) <br /> n = 31 ,800 moles/day <br /> Calculation of Mass Flow Rate of Constituents <br /> • assume molecular weight of TPH as gasoline = 86 grams/mole <br /> TPH as gasoline (31 ,800 mole/day)(0 0022 lb/gram)(86 gram/mole)(85,000 ppmv <br /> *10-") = 510 Ib/day <br /> IBenzene (31 ,800 mole/day)(0 0022 Ib/gram)(78 gram/mole)(550,000 ppbv * 10- <br /> 9) = 3 0 lb/day <br /> IToluene (31 ,800 mole/day)(0 0022 Ib/gram)(92 gram/mole)(100,000 ppbv * 10- <br /> 9) = 0 64 Ib/day <br /> Ethylbenzene (31 ,800mo1e/day)(0 00221b/gram)(106gram/mole)(29,000ppbv <br /> * 10 9) = 0 22 Ib/day <br /> Xylenes (31 ,800 mole/day)(0 0022 lb/gram)(1 06 gram/mole)(85,000 ppbv * 10 <br /> 9) = 0 63 Ib/day <br />