a) What is the value of the rate constant in the first-order substrate removal expression equivalent to the Monod expression that has a k of 1.5d1 and K of 90mg/L for S values of 180 and 25mg/L ? Assume that Xv is unchanged. b) Perform the same exercise as in (a) to relate first-order kinetics to Monod kinetics if k and K are 1.5d1 and 90mg/L, respectively, in the latter equation and Xv is 3000mg/L (20 marks)