Units problems (easy-to-avoid mistakes in this class are due to unit conversions and reporting) Concentrations are mass/volume or mole/volume. Rates are always given in "units per time" where 'units' are mass, volume, length... SHOW ALL CONVERSIONS (you may not use the units converter on your calculator)! And don't forget to answer with reasonable numbers of significant figures. a. Convert 0.5 m^3/sec to millions of gallons per day. b. The normal ingestion rate of water is 2.3 l/day for an adult (see p. 245). How many gallons per day is that? c. At the normal water ingestion rate, how much water does a child drink by age 5? Give your answer in 5 different units: liters, gallon, ft^3, kg, and Ibs. d. If that water contains 0.5 mu g of lead per liter (mu g/I), what total mass of lead would that child have taken in by age 5, mg? e. If all lead remains in the body, what is the concentration of lead in that five year old, if the five old has an average body weight? f. If a can of Fresca (12 fl oz.) contains 35 mg of sodium, what is the concentration in mg/I? g. What is the % of salt by weight in the soda above in part f? h. If a person drinks 1 soda (12 fl oz) every day for the next 40 years, what mass of sodium have they consumed? (kg and lbs) i. If everyone in the world used water at the US reported rate of 90 gallon/day (source = USGS) what is the rate of worldwide water use in m^3/day and in liter/second? (The world population is currently estimated as 7.53 billion people.) j. If the 40 people in this class each use the US per capita average of gasoline per year, 440 gallons (source: US EIA), what is the volume of gasoline used over one decade? (gallons) k. At that average rate, what is the mass of gasoline used by the class per year (kg/yr)? Use a density of 6.073 lb/gal for gasoline. I. Every kilogram of gasoline becomes about 2.7 kilograms of CO_2. What is the mass of carbon dioxide generated by this class (40 people) in a year from gasoline use?