c) Calculate the transmittance given that the absorbance is 0.279. d) Calculate transmittance given that the percent transmittance is 68.2%. e) Calculate percent transmittance given that the absorptivity is 15623 L/mol cm, pathlength is 1.00 cm, and the concentration is 5.33 x 10 M.

If a solution has an absorbance value of 0.518 at a wavelength of 460 nm, what is the percent transmittance of this solution at this wavelength?

Calculate the absorbance for a solution containing a colored species with a percent transmittance (%T) of 58.23.

Indicate the relationship of proportionality that exists between: a) concentration and absorbance b) absorbance and transmittance

2. Calculate the absorbance value (A) for a solution that absorbs 89.5% of the light striking it. (Hint: What is the percent transmittance? Review the background reading)

A sample has a percent transmittance of 50.0%. What is its absorbance?

3. You have two solutions containing the same compound having the same pink color. The concentration of the first solution is 2.0 M, while the concentration of the other solution is 2.5 M. Absorbance of each solution was measured with the same spectrophotometer at the same wavelength. a) Which solution has the more intense pink color? b) Which solution has the higher absorbance?

A solution with a known concentration equal to 3.4 mM gave an absorbance reading of 0.820 in a spectrophotometer. Assuming that there is a linear relationship between concentration and absorbance up to a concentration of 4.0 mM, what would the absorbance reading be for a solution with a concentration 2.2 mM?

Spectrophotometry and Beer's Law 4. A solution has 23.6% transmittance in a cell with a path length of 1.00 cm. If the material responsible for the absorption of light has a molar absorptivity e = 36.2 (L/mole-cm) at the wavelength used, calculate the concentration of this solution in mole/L. (Show all work.) M

A student mixed 5.00mL of 0.0020M Fe(NO3)3, 3.00mL of 0.0020M KSCN, and 3.00mL of distilled water. The mixture reacted to form a reddish solution indicating that FeSCN2+ was formed, according to the equation below. An absorbance of 0.21 was measured for this solution in a Spectrophotometer set at a wavelength of 447nm. Fe³+ (aq) + SCN (aq) FeSCN2+ (aq) A calibration curve was used to find the equilibrium concentration of the product of this reaction: y = 1895x + 0.027 Calculate the equilibrium concentration of the Fe³+ Report your answer to 4 sig figs