Asadable Fronc Dur Date Points Possable Grade Category Map e Sapling Learning a

Question

Asadable Fronc Dur Date Points Possable Grade Category Map e Sapling Learning a of two pure The IR infrared) compounds (0010 M compound A in solvent and b.010 M compound B in solvent) are shown to the right The cm. Note that the y axds in the spectra is transmittance rather than absorption, so that the wavenumbers at which there is a dip in the curve correspond to absorption peaks. 90 of the cell is 1.00 70 50 40 30 20 10 You can vnew sa You have five You lost 10% answer in your attempt at tha A mixture of A and B in unknown concentrations gave a percent transmittance of 48.3% at 2976 1 and 41.9% at 3030 cm", 3040 2990 2940 2890 0010 MB Unknown Wavenumber 0010 MA 3030 Cm'i | 35.0% 2976 cm.| | 76.0% 93.0% 42.0% 41 g% 483% °Help with Th What are the concentrations of A and 8 in the unknown sample? Number O Web Help &V; M B M A Technical

Explanation / Answer

wave number (cm-1)

A

B

unknown

3030

0.456

0.0315

0.378

2976

0.119

0.377

0.316

Absorbance = A = E x b x C

wave number

A

B

3030

E = 45.6 M-cm-1

3.15 M-1 cm-1

2976

E = 11.9 M-1 cm-1

37.7 M-1 cm-1

0.378 = 45.6 A + 3.15 B ----------------------(1)

0.316= 11.9 A + 37.7 B ---------------------(2)

by solving these two

A = 0.00788 M

B = 0.00589 M

wave number (cm-1)

A

B

unknown

3030

0.456

0.0315

0.378

2976

0.119

0.377

0.316

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