What is the molar absorptivity of benzoic acid at 228 nm? (assume path length = 1 cm)?

What is the molar absorptivity of benzoic acid at 228 nm? (assume path length = 1 cm)? The absorbance is .8 For concentration….it says all solutions contain 0.010 M HCl and another part says spectra of caffeine, benzoic acid, and a mountain dew sample in 0.10 M HCl. On a graph it has the points 8.74 mg/L for benzoic acid, 1.5 dilution for mountain dew soda, and 10.88 mg/L for caffeine. I can’t figure out what to use for the concentration, but I get a hint that says to take note of the units for molar absorptivity.

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