# Hi, I need help with answering these questions. Thank you. 1) What is the molar absorptivity…

Hi, I need help with answering these questions. Thank you.

1) What is the molar absorptivity of riboflavin (with units)? Assume that the cuvette has a pathlength of 1.00 cm and that the blank had an absorbance of 0.00.

2. If a sample of riboflavin with an unknown concentration had an absorbance of 0.597, what is the concentration of the sample?

3. A sample of riboflavin is prepared by crushing 5 tablets and dissolving them in enough water to create a 500.0 mL solution. The sample has an absorbance of 0.597. How many mg of riboflavin were in each tablet? MM of riboflavin = 376.37 g/mol

4. If a blank sample containing all the tablet ingredients except for riboflavin had an absorbance of 0.145, then what would be the concentration of our sample with an absorbance of 0.597?

Absorbance of Riboflavin at 445 nm y = 26587x R2 = 0.9994 Absorbance 0.00002 0.00004 0.00006 Concentration of Riboflavin (M)
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