Question

The figure shows the absorption spectra of two pure compounds, A and B, each at a concentration of 1.50×10−4 M.

The table shows the measured absorbance of these standards in a 1.000 cm pathlength cell at five different wavelengths, along with the absorbance of an unknown mixture of the two compounds at the same wavelengths.

Wavelength (nm)	Compound A standard	Compound B standard	Mixture
440	0.430	0.213	0.268
470	0.642	0.367	0.434
500	0.609	0.444	0.478
530	0.392	0.457	0.427
560	0.231	0.334	0.296

Use a spreadsheet to calculate the concentration of each compound in the mixture.

[A]=.......M

[B]=.........M

Answer 1