Advanced oxidation processes can be employed to remove organic and inorganic contaminants during the treatment of water and wastewater. The reaction between the hydroxyl radical (HO-), the material responsible for removing contaminants during treatemnt, and the target compound, R, is represented as follows: HO +R→ byproducts The rate law for decay of the target compound, rR, corresponding to this reaction is: TR = - KRCHO-CR Estimate the volume of a PER reactor needed to achieve 95 percent reduction of chlorobenzene, by advanced oxidation, using HO concentrations of 10-9 moles/L; 10- 10 moles/L; and 10-11 moles/L, if the flowrate is 3800 m/day, k is 4.3*109 L/mol-s, and the initial concentration of chlorobenzene is 25 ug/L for each reactor. Be sure to explain your thought process.

10. Describe the procedure for determining average grain size using the Linear Intercept method.

Choose the option which correctly represent the labelling of the equipments shown in the figure below. |=? Il =? III =? A. I. Cylinder II. Titrant III. Burette B. I. Burette II. Titrant II. Erlenmeyer flask C. I. Erlenmeyer flask II. Analyte III. Burette D. I. Erlenmeyer flask II. Burette III. Analyte

In the McCabe–Thiele method, are the stages stepped off from the top down or the bottom up? In either case, when is it best, during the stepping, to switch from one operating line to the other?Why?