A sample of a pure compound with an unknown molar mass (or formula weight) is weighed (exactly 1.017 mg) was dissolved in the 5.00 mL solution. The compound is colored and has a characteristic visible band at 520 nm. A 1.00 m Aliquots of this solution was placed in a 10-mL volumetric flask and diluted to the mark. The absorbance of the solution (from the 10-mL volumetric flask) at this wavelength was 0.427 in a 1.000-cm covet. The extinction coefficient at this wavelength was determined by an
Independent method to be ε520= 6130 M-1 cm-1.
1. Determine the concentration of compound in the covet (i.e. as extracted from the diluted solution)
2. Determine the concentration of the compound in the original 5-mLsolution
3. Determine the molar mass of the compound under investigation.