Absorbance taken Question A.: 2. 3, 4. readings Volume SmT 10 ml is mi 20 ml a Plo + absorbance for these Absorbance. against 0,076 0,16 9 9185 0,234. Calibration curve concentration of

1.37 Calculate the Unsaturation Index of each Compound ( b = 1.37 ppm, resonances singlet, 9H Compound 17a. C,H,,O2 Unsat. Index (2C + 2 - H - X + N)/2 = Ja=11.28 ppm, singlet, 1H 8, ppm 11.28 2.5 2.0 1.5 3.5 3.0 5.5 5.0 4.5 4.0 8.0 7.5 7.0 6.5 6.0 of 12.0 11.5 11.0 10.5 10.0 9.5 9.0 8.5 1) SOCI2; 2) NH3 (excess) 3) Br2, NaOH, H2O 1.15 b = 1.15 ppm, singlet, 9H Compound 17b. C,H,,N Unsat. Index = (2C + 2 - H - X + N)/2 = a = 3.96 ppm, 1 singlet, 2H 8, ppm 3.96 10.5 10.0 9.5 9.0 8.5 8.0 7.5 7.0 6.5 6.0 5.5 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 8 in

Practice: uncertainty and relative uncertainty You prepared a 0.250M NH3 solution by diluting 8.45 (+±0.04)mL of 28.0 (±0.5)wt% NH3 (density = 0.899 ± 0.003)g/mL) up to %3D 500.0 (±0.2)mL. Find the uncertainty in 0.250 M. Consider the molar mass of NH3, 17.031g/mol, to have negligible uncertainty. hp

QUESTION 7 The absorbance of two chromate solutions at a set wavelength is given in the table. Which solution has a higher molarity of chromate ions? Solution Absorbance 0.324 0.566 Solution A Solution B both have the same molarity can't be determined insuCrs to saue all amswers.

QUESTION 10 Three titration trials were performed and three molar concentrations of NaOH were calculated. The three molar concentrations are as follows: 0.10 M 0.12 M 0.19 M Calculate the standard deviation of the molar concentration of NaOH. Click Save and Submit to save and submit. Click Save All Answers to save all answers. 13 10 5. 6. 8. 近

2. A new electrochemical method relates concentration to current. The slope of the calibration curve is 0.438 nA/µM. Replicate analysis of a low concentration solution gave the following readings: 2.39 nA, 2.45 nA, 2.54 nA, 2.76 nA and 2.58 nA. a. What you think the difference is between detection and quantification? b. Please calculate the limit of detection. c. Please calculate the limit of quantification.

QUESTION T5 Why were the areas underneath the peaks in the gan chromatographs you eobtained mutiplied by a weight tactor? DA the corrction factor compensates for user error OB Rame lonization detectors (FID) respond slightly dfferent to compounds with diferent molecular weights OCnone of the answers OD. the GC (GOW MAC 350) used contains a quadrapole mass spec detector whose response must be corrected for the miz ratio of the diferent ions obtainen for diferert moleculestune OE not all molecules have the same themmal conductivity QUESTION 16 Which list of functional groups is present in the anti-viral drug Arbidol HO Br O A Thioether, alkene, ester, amide, amine O 8. Thioether alcohol, ester, amine OC Alcohol, ether, amide, epoxide, thioester OD. Ether, ketone olefin, amine, alcohol O E Thioalcohol, alkene, ether, amine, nitro

please help me find average and standard deviation

Directions: (1) Determine the total volume of the standards by using a formula in the appropriate boxes (your instructor will help you with this). (2) Determine the concentration of Cu2+ in each standard, also using a formula in the appropriate cells. (3) Plot the absorbance as a function of Cu2+ concentration. Determine the equation for the best-fit line. 1.0 M ethylenediamine (mL) concentration Cu2+ absorbance (AU) at 550 nm 0.01 M CuSO4 5H2O H2O total volume stock Cu2+ standard (mL) (mL) (mL) (units) concentration (M) 1 0.50 0.00 9.50 0.025 0.01 2 0.50 0.50 9.00 0.031 0.01 3 0.50 1.00 8.50 0.048 0.01 4 0.50 2.00 7.50 0.153 0.01 5 0.50 3.00 6.50 0.223 0.01 0.50 4.00 5.50 0.307 0.01 7 0.50 5.00 4.50 0.384 0.01

5. The percent relative uncertainty of a burette reading of 24.35± 0.02 is: a. 0.00082% b. 0.0008% c. 0.08% d. 0.082% M JA