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How many peaks can you identify from the NMR spectrum? To which does each chemical shift peak corresponds?
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- (4.2) Finding the series limit for sodium Eight ultraviolet absorption lines in sodium have wavenumbers of 38 541, 39 299, 39 795, 40 137, 40 383, 40566, 40 706, 40 814, in units of cm-¹. Devise an extrapolation proce- dure to find the ionization limit of sodium with a precision justified by the data. Convert the result into electron volts. (You may find a spreadsheet program useful for manipulating the numbers.) What is the effective principal quantum number n* of the valence electron in the ground configu- ration?(5) Please help me with my assignment4. (14 points) A soil sample (4.00 g) is digested and analyzed for Cd by atomic absorption analysis. The digestion results in 25.0 mL of extract. Because there is concern of matrix effects, standard addition is used. A portion of the extract is analyzed directly by AA and gives an absorbance of 0.211. Another 10.0 mL portion of the extract is spiked with 50.0 ug of Cd (ignore any added volume from Cd spiking) and gives an absorbance of 0.539. a) Calculate the Cd concentration in the (unspiked) extract (in ug/mL). (8 pts) b) Calculate the Cd concentration in the soil in ppm (by mass). (3 pts) c) A Cd standard prepared in dilute nitric acid to a concentration of 1.00 µg/mL is analyzed and gives an absorbance of 0.191. Was the standard addition justified? (3 pts)
- what are the multiplicities and their chemical shiftsWhat is the name of the standard that defines zero on the chemical shift axis? (The standard must be a molecule with protons in only one type of environment.) -Tetramethylsilane -Propanoic acid -Ethanol -ButaneWhat is the chemical shift, multiplicity, and integration?
- Calculate the resolution required to resolve the following peaks; i) CH3N+ (MW = 28.0187) and N2+ (MW = 28.0061) ii) C2H4+ (MW = 28.0313) and CO+ (MW = 27.9949) iii) C3H7N3+ (MW = 85.0641) and C5H9O+ (MW = 85.0653) iv) 116Sn+ (At W = 115.90219) and 232Th2+ (At W = 232.03800)Challenge Problem: The following are three sets of data for the atomic mass of antimony from the work of Willard and McAlpine': Set 1 Set 2 Set 3 121.771 121.784 121.752 121.787 121.758 121.784 121.803 121.765 121.765 121.781 121.794 (a) Determine the mean and the standard deviation for each data set. (b) Determine the 95% confidence interval for each data set. (c) Determine whether the 121.803 value in the first data set is an outlier for that set at the 95% confi- dence level. (d) Use the t test to determine whether the mean of data set 3 is identical to that of data set 1 at the 95% confidence level. (e) The means of all three data sets are to be compared by ANOVA. State the null hypothesis. Determine whether the means differ at the 95% confidence level. (f) Pool the data and determine the overall mean and the pooled standard deviation. (g) Compare the overall mean of the 11l data points to the currently accepted value. Report the absolute error and the relative error in percent…A particular liquid crystalline substance has the phasediagram shown in the figure. By analogy with the phasediagram for a nonliquid crystalline substance, identify thephase present in each area.
- 5.2 5.3 Briefly discuss the importance of sample preparation in a modern-day laboratory. Using your understanding of separation science, how has sample preparation taken advantage of the theory of separation? The van Deemter equation relates the resolving power (HETP, height equivalent to a theoretical plate) of a chromatographic column to the various flow and kinetic parameters which cause peak broadening. H = A + B/u +Csu (a) Identify which term in the equation represents Eddy diffusion. (b) Explain how it contributes to peak broadening.Qq.17. Subject :- ChemistryA solution of phenolphthalein has been analyzed by absorbance spectroscopy. The ɛl for the spectrophotometer was determined to be 7695 M¯1. If the absorbance of the solution is 0.158 what is the phenolphthalein concentration ([Ph2], M)? Your Answer: Answer units