This question provides an example calculation to help you determine the molarity of the fescn 2+ solutions at equiLiBrium from experimental data. For the following results: absorbance, trial 2: 0.214; absorbance of standard solution: 0.549; concentration of standard solution: 0.000200 M. The concentration of fescn 2+ at equiLiBrium for this trial is [a] M. (Hint: What equation should you use ________.)