Chemistry 325 Instrumental Analysis February 3, 1995 1 Exam 1 ...

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Chemistry 325 Instrumental Analysis February 3, 1995 c. What is the function of a monochromator in a spectrometer that employs a tungsten halogen source? d. What is the purpose of the chain of dynodes in a photomultiplier tube? e. In a ultraviolet-visible spectrometer, why is the sample placed after the monochromator? f. Compute the energy in joules of a photon whose wavelength is 321 nm. 3. (10 points) You are given the following information regarding the precision of four pipets: volume standard deviation 1 mL 0.006 mL 7 mL 0.02 mL 9 mL 0.02 mL 15 mL 0.03 mL If you wish to deliver 16 mL, compute the error in each of the two possible delivery methods: (1) 15 mL + 1 mL or (2) 9 mL + 7 mL.
Chemistry 325 Instrumental Analysis February 3, 1995 4. (10 points) The drug tolbutamine (FW=270) has a molar absorptivity of 703 cm -1 mole -1 L at 262 nm. One tablet weighing 1.113 g is dissolved in water and diluted to a volume of 2000 mL in a volumetric flask. If the solution exhibits an absorbance at 262 nm equal to 0.687 (1.0 cm pathlength cell), what is the weight percent of tolbutamine in the tablet?
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Chemistry 325 Instrumental Analysis February 3, 1995 1 Exam 1 ...

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