A student performed three DCM layer titrations in Part 2 and they reported the following measurements: Which determinations were the student's 'best two'? Calculate the percent difference for the 'best two' and show the complete calculation. Note that the concentration of standard sodium thiosulfate, which the student used, is unknown. What is the absolute difference in your total concentration of iodine in the CH2Cl2 phase, in mol/L, between your 'best two' determinations in Part 2 of the experiment? Use your own lab-obtained data. Report your answer to the correct number of significant figures and only include the numerical value (no units)