The transformation of 1,1,1 trichloroethane (1,1,1-TCA) by the mineral iron sulfide (FeS) has been shown to be a 2nd-order reaction, depending on the concentration of 1,1,1-TCA remaining and the surface area concentration of FeS (in m2/L). The transformation of 1,1,1-TCA by anaerobic bacteria is also 2nd-order, depending on the 1,1,1-TCA concentration and the concentration of bacteria (mg/L). It is hypothesized that when FeS and bacteria are combined in one system, total removal can be described by parallel and independent second-order rate expressions.
a) Write the rate expression describing the total removal of 1,1,1-TCA by the combination of FeS and bacteria
b) Assuming that [FeS] and [bacteria] can be considered to be constant (i.e., changing only slightly during the time of interest), convert your answer for (a) into a pseudo-first-order expression such that removal is 1st-order with respect to 1,1,1-TCA only and containing a single rate coefficient. What is the equation for the rate coefficient?
a) The reaction rate expression is:
rate = k * [FeS] * [Bacteria]
b) If both concentrations are equal, a pseudo first reaction order can be assumed, taking into account that both reactants start at the same concentration and will disappear at the same rate:
rate = k * [Reagent]
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The transformation of 1,1,1 trichloroethane (1,1,1-TCA) by the mineral iron sulfide (FeS) has been shown to...
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