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You are measuring the absorption of an unknown solution. Your friend tells you it has an...

You are measuring the absorption of an unknown solution. Your friend tells you it has an absorption of 0.997 and a molar extinction coefficient of 5 mm-1M-1. if the average length of a cuvette is 1 cm, what is concentration of this unknown liquid?

A.0.1994 mols/L

B.0.01994 mols/L

C.0.001994 mols/L

D.1.994 mols/L

Please show calculations. And can someone explain what "a molar extinction coefficient of 5 mm-1M-1" means? I am not used to seeing the molar extinction coefficient in this form. I am used to seeing it in "some value cm^-1*M^-1"

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