Please help me with this question

Question

A substance has a molar absorptivity constant of 0.233 M^-1cm^-1. When a sample was placed in a 1 cm cuvette and was placed in the spectrometer, it was found to have an absorbance of 0.503. What is the concentration of the substance?

2.16 M

0.463 M

8.58M

C Cannot be found with information given annot be found with information given

Answer 1

Use the Beer-Lambert law:

A = ecl

A = absorbance = 0.503

e = extinction coefficient = molar absorptivity = 0.233 M^-1cm^-1

c = concentration = ?

l = path length in cm = 1

Solving for c, we have ...

c = A/el

c = 0.503 / (0.233 M^-1cm^-1)(1cm)

c = 2.16 M