8.50 kg of a soluble pesticide was accidentally spilled into a small lake. The surface area, average depth, and flow of the lake are given as 109 m, 5.0 m, and 10 m³/yr, respectively. The pesticide is subject to decay with a first-order decay rate coefficient of 0.01/day a) Calculate the pesticide concentration (in ug/L) in the lake immediately after the spill. b) What is the concentration of pesticide (in ug/L) in the lake after 50 days? c) Using EXCEL, calculate and plot the pesticide concentration (in ug/L) in the lake versus time for 0 t 300 d