3-3. Pich and Larachi (2007) proposed the following reaction for the oxidation of polysulfide ions (S,2, where n can be any value 2) to form thiosulfate ions (S032) and colloidal sulfur (Sg): 3 S2+O2S2O3- + n 2 - 8 -S8 (a) For n=6, write expressions for rs203- and rs, in terms of rs2-, if all the rates are given in units of mol/L h. (b) Repeat part a, if the rates are in mg/L-h of the respective chemicals; designate these rates as r'. (c) Repeat part a, if the rates are in mg S/L h; designate these rates as r".