text: idnetify the catalyst in the following mechanism. st:1 fe+2i-fe+i st:2 s2o8+fe-2so4+fe? also, calculate the equilibrium constant kc=2.3*10^-7 and kc=1.4*10^-3 catalyst is something that's there at the beginning of the first step, and at the end of the last step.  in this case, it would be fe.  the equilibrium constant part is unclear