I answered this just a few posts back but the molarity was different.
Absorbance = slope x C will get A.
Then A = log (1/T) will get transmittance.
transmittance x 100 = %T.
An unknown was prepared with the concentration of 0.000520 M. A Beer's Law plot was prepared using the absorbance values from standard solutions of ASA and a line drawn through all the points passed through the origin with a slope of 1550.2 M–1 . The expected absorbance and %T values for the diluted aspirin solution prepared by the student is
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