At 580 nm the wavelength of its maximum absorption, the complex FeSCN2+ has a molar absorptivity of 7X10^3 L cm-1 mol-1 calculate
a. the absorbance of a 3.75X10-5 M solution of the complex 580 nm in a 1-cm cell
b. the absorbance of a solution in which the concentration of the complex is twice in that of a
c. the transmittance of the solutions described in a and b
d. the absorbance of a solution that has half the transmittance of that described in a