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hi i need a lot of help. I need to find the molar absorptivity of yellow dye. A 1.50 x 10^-5 M solution of this dya has an absorbance of .209 at its (wavelength sign)max. The path length is 1.0cm can anyone explain to me how to find the molar absorptivity? Step by step if possible. THANKS!

2007-11-15 05:10:11 · 2 answers · asked by Anonymous in Science & Mathematics Chemistry

2 answers

Absorbance is as simple as a, b, c

A = abc

A = absorbance

a = molar absorptivity
b = cell length
c = concentration

A = 0.209

c = 1.5 * 10-5 M
b = 1 cm

so a = A/bc = 0.209/ 1cm * 1.5*10-5mole/L =

= 13933.3 L/cm•mole

2007-11-15 05:21:29 · answer #1 · answered by Dr Dave P 7 · 1 0

Definition: Absorbance = concentration x pathlength x molar absorptivity.

That's all! Shove in the numbers. Give your answer in the correct units (that's the only tricky bit, but I don't know what units you want so I can't help you)

2007-11-15 13:21:09 · answer #2 · answered by Facts Matter 7 · 0 0

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