Iron(III) chloride is reduced by tin(II) chloride.
2 FeCl3(aq) + SnCl2(aq) ---> 2 FeCl2(aq) + SnCl4(aq)
The concentration of Fe3+ ion at the beginning of an experiment was 0.03540 M. After 4.00 min, it was 0.02641 M.
What is the average rate of reaction of FeCl3 in this time interval? __ M/min