The absorption coefficient of a new complex FeX2 (X=1,10 phenanthroline, MW = 180.21) was measured as 1,400 / M cm at 355 nm. what would be the measured absorbance at this wavelength if 0.100g of Fe(NO3)2 was mixed with 0.100g of phenthroline ligand in 500mL of water, and 3-mL sample was measured in a 1cm cuvette?

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Iron II reacs with 1,20 phenanthroline (phen) to form a stable complex ion under acidic conditions:Fe^+2 + 3 Phen---------?Fe(phen)3^+2The complex absorbs in the visible portion of the spectrum with wavelength max=510 nm. An ore sample containing 3.147% iron with mass of 1.0637 g was digested and diluted to a final volume of 1.00 L. The absorbance of this solution was measured at 510 nm using a 1.000 cm cuvette and had a value of A=0.6891 abs. An unknown sample with mass .2130 g was digested with the identical procedure and produced an abs of A=.2186 abs. Determine the percent iron in the unknown sample

For the UV-Vis absorption data below, calculate the concentration for the metals M²⁺ and N²⁺ in a river sample if the unknown solution was prepared by diluting 10.00 mL of river water with 10.00 mL of ligand solution and diluted to a final volume of 100.00 mL. Assume the absorbance was measured in a 1.00-cm cell.

Solution	Wavelength	Concentration	Absorbance
M²⁺ standard	650 nm	1.82E-05	0.723
N²⁺ standard	650 nm	1.82E-05	0.312
M²⁺ standard	425 nm	1.82E-05	0.199
N²⁺ standard	425 nm	1.82E-05	0.811
Unknown	650 nm	?	0.753
Unknown	425 nm	?	0.536

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