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Converting Absorbance readings to nmol p-nitrophenol/ml

I just had an experiment regarding the determination of the activation energy of an enzyme catalysed reaction.

I got my absorbance readings at a wavelength of 405 and then calculated my concentration. On step 2 it is asking me to convert my absorbance readings to nmol p-nitrophenol/ml and i simply have no clue how to do it.

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