Final answer:
The molar absorptivity of FeSCN2 can be calculated by dividing the observed absorbance value at its maximum wavelength by the concentration of the sample.
Step-by-step explanation:
The molar absorptivity, also known as the extinction coefficient, of FeSCN2 is a characteristic value for this compound. It can be calculated by dividing the observed absorbance value (A) of FeSCN2 at its maximum wavelength (Amax) by the concentration (c) of the sample in moles per liter (mol/L). The units for molar absorptivity are L·mol-1·cm-1.