The concentration of X in an unknown solution is to be determined using the internal standard method. The internal standard Y is present in all solutions at a concentration of 8.5410^-2 M. In a preliminary experiment, a solution containing 1.6210^-2 M X and the internal standard resulted in peak areas of 9750 and 4852 for X and Y, respectively. What is the response factor F for analyte X?

An unknown sample is run and the areas of the X and Y peaks are 8600 and 4873, respectively. What is the concentration of X in this sample?