QUESTION 3 What is the extinction coefficient of Fe(SCN)2+ in this experiment? Hint: The value you need is located on page 168 of your lab manual. Give the answer in L/mol-cm as shown in the manual. QUESTION 4 How do you convert between %T and Absorbance? OA. A = %T x 100 B. A = 1/%T x 100 OC. A = log (100/%T) OD.A = log %T

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Using the data below, please create a calibration graph and determine the concentration of the unknown sample. Standard #1 Standard #2 Standard #3 Unknown sample Concentration 1.5 x 10 M 2.0 x 103 M 2.5 x 10 M ? Absorbance 0.61 0.80 0.98 0.72 a) 1.6 x 10 M b) 1.8 x 10° M c) 2.1 x 103M d) 2.2 x 10 M

Pre-lab question #6-4: Calculate the percent (%) C2042- in K3[Al(C204]3]-3H20. 57.1 65.7 97.8 53.0

Mass spectrometry of chlorine from an asteroid sample is shown. Intensity 34 35 36 37 38 Mass u What is the relative abundance of 35C1 in this sample? 57.1% (42.9% _) 52.8%

Please answer the question correctly is all I want and explain why its thats answer for the final and please answer as quickly as possible, thanks! You graph the calibration curve of a solution of an unknown metal (we will call it M+) at 400 nm. The graph is shown below. What is the absorbance of a 80 mmol/L solution of the metal at 400 nm?

The amount of ascorbic acid in cashew juice of different brands was determined by two different methods, colorimetry and titrometry. The results obtained for the two methods for analyzing the different cashew juice are necessary in the following table. Sample Colorimetry (mg/100g) Titrometry (mg/100g) juice brand A 152,2 153,7 juice brand B 150,7 150,7 juice brand C 18,7 18,7 juice brand D 67,4 67,4 Can the two methods be used, indistinctly, to determine ascorbic acid in cashew juice, at a 95% confidence level? Explain.

A series of six solutions was prepared at the given concentrations. Sample AB C D E F Concentration (mM) 50 100 | 150 | 200 300 400 The absorbance of each solution was then measured using a colorimeter. Sample A B C D E F Absorbance 0.25 0.50 0.75 1.00 1.50 2.00 What is the concentration of the solution with an absorbance of 1.50? C = mM

Week 8-1 X + " https://app.101edu.co 79°F Mostly cloudy Substance NH:(9) HCI (g) NH.CI (S) Chapter 5 x 00 5.3 The Fu X 00 Quiz 5.1 to x 0o DESU Calc X 2 W " # 3 * E $ 4 27 O R 12 Calculate AS for NH3(g) + HCI(g) → NH4Cl(s). % 5 " Search 40 6 الت " S* (J/mol-K) 192.5 186.7 94.6 4- & 7 YIL M Log In | Fe X Aktiv Chen X U Question 8 of 23 4+ 8 DA hp 9 ► 11 M ) IL O O Flashcards X O A4 P C { Photograp X A + L A = O Welcome X Ⓒ P } 1 4 7 +/- G prt sc 。 2 5 8 delete backspace B Log In | Fe X + J/mol K 3 6 9 0 home . num lock x 1 end G 7 home

A. Copper sulfate pentahydrate is often used to teach students about Beer’s Law by making a standard curve (linear regression). The bright blue color of the solution has a peak absorbance in the red range of the electromagnetic spectrum. The absorbance value is proportional to concentration. How many grams of CuSO4 5H2O to make up 250 mL of a 0.2 M stock of this solution? B. Using M1V1 = M2V2 how many mL would a student need to measure out in graduated cylinder to make up a 50 mL (V2) solution of 0.1M, 0.05 M, 0.025M 0.0125M solutions for a standard curve at the peak wavelenth for this compound? I need help with part B of this question.