Final answer:
Although the direct calculation of moles of CuSO₄ from provided details is not possible, the solution involves creating a calibration graph, using absorbance to determine the concentration of the impure sample and then calculating the moles based on concentration and volume of the solution prepared from the impure CuSO₄ sample.
Step-by-step explanation:
The question asks to determine the number of moles of CuSO₄ in an impure sample using a spectrophotometer. However, given the information in the question, it's not possible to calculate the number of moles directly as it would require the absorbance data for the impure sample which isn't provided.
A correlation could be established between the absorbance and concentration of CuSO₄ solutions using the calibration graph. Then, the concentration of copper sulfate in the impure sample could be determined by measuring its absorbance and using the correlation from the calibration graph.
After the concentration of the solution prepared from the impure sample is known, the molar mass of CuSO₄ (159.62 g/mol) could be used to determine the number of moles of CuSO₄ in the sample. The number of moles could be calculated by isolating the moles in the equation, c = n/V. In this equation, 'c' is the concentration (in mol/L or M), 'n' is the number of moles, and 'V' is the volume (in L). By rearranging the equation to n = cV, the number of moles can be calculated using the determined concentration and the volume of the solution made from the impure sample.
Learn more about Moles of CuSO₄