Homework 1 LA liter of water was found to contain 5 mg of benzene (CH). What is the concentration of benzene in (a) mg/L (b) ppm (c) molarity? 2. A power plant emits 120 lb of fly ash per hour up the stack. The flow rate of the hot gases in the stack is 25 ft/sec. What is the concentration of the fly ash in (a) micrograms per cubic meter? 3. A stream flowing at 60 gal/min carries a sediment load of 2000 mg/L. What is the sediment load in kilograms per day? The proposed air quality standards for ozone (0) is 0.08 ppmv. Express that standard in g/m at 1 atm of pressure and 25 C. At the elevation of Denver, the pressure is about 0.82 atm. Express the ozone standard at that pressure and at a temperature of 15 C. s. Assume that the world will burn 44 quads of fossil fuel (coal, oil, and gas) next year. For the total mix of fossil fuel, the average energy content is 15,000 Btu/pound, and the average carbon mass fraction of the fuel is 0.83. How much CO, is formed per year from fossil fuel combustion, if 3.67 pounds of CO are produced for every pound of carbon burnt? (1 quad = 10 Btu)