An ideal continuous stirred tank reactor (cstr) has an influent containing chemical x at a concentration of 150 mg/l and a flow rate of 100 gpm (380 liters/min). chemical x undergoes a first-order decay reaction having k = 0.40 hr determine: a. the required detention time and volume of the cstr if the effluent concentration contains 20 mg/l of chemical x. express the volume in both gallons and liters. b. use a spreadsheet to perform the necessary calculations and then use the spreadsheet's graphing tools to plot two graphs; i. pollutant removal efficiency, e (defined in homework #4 problem statement), on the vertical or y-axis versus hydraulic detention time on the horizontal or x-axis. ii. effluent concentration, cxi, on the vertical or y-axis versus hydraulic detention time on horizontal or x-axis. analyze and comment on the significance of the graphs. c. how many times larger must a cstr be than a pfr to achieve 80 percent pollutant removal or conversion? d. how many times larger must a cstr be than a pfr to achieve 90 percent pollutant removal or conversion?

1. an experiment in your science class lists the materials needed for the lab. it is your job, as a lab partner, to measure out 25 ml of distilled water and 2.5 grams of magnesium. what lab measuring tools would you choose to measure each substance and how would you use each tool to get the correct amounts? be sure to describe the process you would follow step-by-step. (5 points) 2.which of the following is an si base unit for measuring mass? (2 points) ampere gram meter pound 3.which of the following is an si base unit for time? (2 points) decades hours minutes seconds 4.which of the following tools should a scientist use to measure an object in milligrams? (2 points) graduated cylinder pan balance tape measure thermometer 4.which of the following tools should a scientist use to measure an object in milligrams? (2 points) graduated cylinder pan balance tape measure thermometer. 5.a pencil beside a metric ruler. the ruler is scaled from 1 centimeter to 10 centimeters, with markings for millimeters between each number. one end of the pencil is beside the 0 on the ruler, and the pencil point is beside the 5. which of the following measurements is accurate but not precise? (2 points) 5 mm 5 cm 50 mm 50 cm 6. which of the following prefixes represents the largest value? (2 points) giga hector kilo milli 7. which of the following types of graphs is best for plotting the percentages of a whole value in a data set? (2 points) bar graph circle graph histogram line graph