Question: Please explain each step used to develop the solution provided. Please explain how the equation for Cmass was known. Thank you The National Ambient Air

Please explain each step used to develop the solution provided. Please explain how the equation for Cmass was known. Thank you

how the equation for Cmass was known. Thank you The National Ambient

The National Ambient Air Quality Standard (NAAQS) for NO2 is 0.053ppmv (annual average). A dispersion modeling analysis of NOx emissions from a source shows a maximum ambient receptor concentration of 220g/m3. The receptor elevation is 6,500ft(Pbar=23.4in.Hg), and the ambient temperature is 70F. The NAAQS (g/m3) is most nearly: A. 50 B. 80 C. 200 D. 450 88. The NAAQS for NO2=0.053ppmv annual average. Max ambient receptor concentration =220g/m3 Receptor elevation =6,500ft Pbar=23.4 in. Hg T=70F Cmass=RTPCvolMWp =1bmolR21.85in.Hg(70+460)R23.4in.Hg(11060.053)(1bmol46lb)=4.926109lb/ft3 Cmass=4.926109ft3lb1b4.536108gm335.31ft3 =78.9g/m3 THE CORRECT ANSWER IS: B

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