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?