The concentration of toxic chemicals in the environment is frequently measured in parts per million (ppm) or sometimes parts per billion (ppb). A solution in which the concentrate of the solute is 3 ppb by mass has 2 g of the solute for every billion grams (1000t) of the solution. The WHO set the acceptable standard for lead in drinking water at 10 ppb. In 1992 1/3 of the homes in Chicago was found to have a lead concentration of 10 ppb. If you lived in one of these homes and dranl 2 L of tap water a day, Explain what is the total mass of lead you have ingested per year?