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(1 bookmark) How can I calculate the Concentraition (M) with this table? (Beer- Lambert Law) concentration(M)...

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How can I calculate the Concentraition (M) with this table? (Beer- Lambert Law)

concentration(M) Absorbance(no units) Lamda(max)(nm)
reference 0 0
#1 1.01 640nm
#2 0.50 640nm
#3 0.26 640nm
#4 0.12 640nm
#5 0.08 640nm
Unknown 0.72 640nm

The cuvette is 1cm.

and the first experiment(#1, I use the 20mL of 1*10^-5 M blue dye.
Each time, I use the pipet to transfer 10mL of solution from #1 and add 10mL water.

And don't know the first condition about the unknown.

I don't know how to use the lambda max to the Beer-Lambert Law.

Help me please .

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