3,4-benzopyene (BP, C20H12) is a toxic aromatic hydrocarbonfrequently found in polluted air. 5.0 liters of air (at standardtemperature and pressure) is bubbled through 10 ml of dilutesulfuric acid, capturing the BP. 3.0 ml of this solution is dilutedto 10 ml, and this final solution gives a fluorescence intensity of205 (arbitrary units). A blank gave an intensity of 35 (sameunits). A solution containing 0.75 mg of BP per ml is prepared and1.5 ml of the this solution is added to 3.0 ml of the initial BPsolution, prior to dilution to 10 ml. This solution gives afluorescence intensity of 294 (arbitrary units).
a) Calculate the mass of BP per liter of air.
b) Express this answer in terms of ppm and ppmv.
