What is the path length in centimeters when the transmittance is #0.692#, the molar absorptivity is #7.39 xx 10^4 "L/(mol.cm)"# and the concentration is #0.0000923 M#?

Question

3148 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2017-03-27T21:36:12

#"0.101 cm"#

Beer's Law:

#"Absorbance" = ("molar absorptivity") xx ("path length") xx ("concentration")#

or

#A = e xx Lxx c#

So

#L = A/ (e c) #

#L = 0.692 / ((7.39*10^4L/(mol*cm) * (9.23*10^-5 (mol)/L))#

#L = "0.101 cm"#