Chapter 5, Problem 3P

A particular food coloring product has a molar absorptivity of 3.8 × 103 cm−1M−1 at λ max 510 nm. Calculate the absorbance and percentage of transmittance for a solution with a concentration of 2 × 10−4 M measured with a 1-cm cuvette at 510 nm.

Which part of the instrument perform the given function                                                                                   introduction of a micro amount of sample                                                                                   converts sample components into gaseous ions                                                                                   orts the ions according to m/z                                                                                   converts m/z values to electrical signals                                                                                   converts signal/results into a mass spectrum A. mass analyzer B. Vacuum system C. Ion source D. Processor E. inlet system F. detectors

A student uses visible spectrophotometry to determine the concentration of CoCl2(aq)CoCl2(aq) in a sample solution. First the student prepares a set of CoCl2(aq)CoCl2(aq) solutions of known concentration. Then the student uses a spectrophotometer to determine the absorbance of each of the standard solutions at a wavelength of 510nm510nm and constructs a standard curve. Finally, the student determines the absorbance of the sample of unknown concentration. The original solution used to make the solutions for the standard curve was prepared by dissolving 2.60g2.60g of CoCl2CoCl2 (molar mass 130.g/mol130.g/mol) in enough water to make 100.mL100.mL of solution. What is the molar concentration of the solution? a.) 0.200M b.) 0.500M c.) 1.00M d.) 5.00M