Answer to Question #177810 in General Chemistry for Sadaf

Question

The absorbance of a solution of 106mg of a compound Butyraldehyde in 100 ml of 95% ethanol in a cell of 1 cm pathlength was found to be 0.28 calculate the molar absorptivity of the compound ?

Answer 1

Molar Mass of Butyraldehyde = 72.11

= 0.106/72.11 = 0.00147 moles

Concentration = 0.00147/(0.095+0.106)

= 0.0073mol/L

= 0.28(1×0.0073)

= 0.002044 L mol^-1 Cm^-1