4. The measured absorbance of a sample in a 1.00 cm cuvette is 0.544. If the...

Question

Question

4. The measured absorbance of a sample in a 1.00 cm cuvette is 0.544. If the concentration is 1.4 x 10-M, what is the molar a

science physics

Answer 1

Answer #1

Given:

Absorbance, A = 0.544

Path length, l = 1.00 cm

Concentration, c = 1.4 * 10-3 M

Now we know that,

Molar absorptivity, E = A/cl

Or,

Molar absorbance Molar absorptivity = 7 y Concentration * path length

Now, put the given values in above formula,

Molar absorptivity = - C*1 0.544 1.4 * 10-3* 1.00 2720 -= 388.57 7

So, Molar absorptivity = 388.57 M-?cm-1

Answer 2

Similar Homework Help Questions

C. Problems 1Explain the difference between transmittance, absorbance, and molar absorptivity Which one is proporti...

C. Problems 1Explain the difference between transmittance, absorbance, and molar absorptivity Which one is proportional to concentration? 2. The absorbance of a 2.3lx 10 M solution of a compound is 0.822 at a wavelength of 266 nm in a 1.00 cm cell. Calculate the molar absorptivity at 266 nm 3. A compound with a molecular weight of 292.16 was dissolved in a 5-ml volumetric flask. A 1.00-mLaliquat was withdrawn, placed in a 10-mL volumetric flask, and diluted to the mark....
Question 8 Status: Tries remaining: 21 Points possible: 1.00 Suppose you measure the absorbance of a...

Question 8 Status: Tries remaining: 21 Points possible: 1.00 Suppose you measure the absorbance of a yellow dye solution in a 1.00 cm cuvette. cm what is The absorbance of the solution at 427 nm is 0.46. If the molar absorptivity of yellow dye at 427 nm is 27400 M the concentration of the solution? Answer: Question 9 Status: Tries remaining: 2 Points possible: 1.00 If you plot the absorbance measurements of solutions vs. their concentrations, what is the slope...
a solution of an analyte is placed in a 1.00 sample cell and has an absorbance...

a solution of an analyte is placed in a 1.00 sample cell and has an absorbance of 0.228 when measured at a wavelength of 490 nm.its molar absorptivity is 676. what is the concentration of the analyte of l/(mol cm)

Absorbance value (A) for a sample prepared was 0.6. The path length (b) of the cuvette...

Absorbance value (A) for a sample prepared was 0.6. The path length (b) of the cuvette used was 1 cm and absorptivity coefficient ε was 0.3 cm2/mg. c is concentration (mg/ml) of the sample in mg/mL. What is the concentration of the sample
Page 9 Questions 1. A substance exhibits an absorbance of 0.47 in a 1.00 cm cell...

Page 9 Questions 1. A substance exhibits an absorbance of 0.47 in a 1.00 cm cell at 525 nm. (a) What will be its absorbance in a 2.7 cm cell? (b) If the substance concentration is 2.1 x 10-5 mol dm, compute its molar absorptivity. (c) What absorbance will it have in a 5.0 cm cell at 2. = 405 nm (think about it!)? 2. You are setting up an absorption spectrometer to determine the concentration of a gas which...
A 5.90 x 10-5 M sample of compound X in a solvent has an absorbance of...

A 5.90 x 10-5 M sample of compound X in a solvent has an absorbance of 0.344 at 528 nm in a 1.000 cm cuvet. The solvent alone has an absorbance of 0.056. What is the molar absorptivity of compound X? € = M-1.cm-1 A different sample of compound X in the same solvent has an absorbance of 0.506 at 528 nm when measured with the same cuvet. What is the concentration of this second sample? [X] = mol X

You are measuring the concentration of Fe2+ in a sample by measuring the absorbance of its...

You are measuring the concentration of Fe2+ in a sample by measuring the absorbance of its complex with ferroxine. Your sample, measured in a 1.00-cm pathlength cuvette, has an absorbance of 0.350. What would be the Percent Transmittance of this solution if measured in a cuvette with 4.00 cm pathlength?
4. The total absorbance of a solution is the sum of the absorbances of all different...

4. The total absorbance of a solution is the sum of the absorbances of all different materials present. At = A + Ab + Ac ... etc. At 427 nm, the molar absorbtivity of Yellow #5 is 2.73x10^M-.cm . At 427 nm the molar absorptivity of Red 40 is 7.49x109 M.cm? Calculate the total absorbance of a solution in which the concentration of Yellow #5 = 4.00x10' M and the concentration of Red 40 - 2.80x10-5M, when measured at 427...
2. The absorbance of a 2.31 x 10 a wavelength of 266 nm in a 1.00...

2. The absorbance of a 2.31 x 10 a wavelength of 266 nm in a 1.00 cm cell. absorptivity at 266 nm. M solution of a compound is 0.822 at Calculate the molar The following absorption data were calculated in-an experiment: 3. Absorbance 0.000 0.090 0.181 0.271 0.361 0.450 0.539 0.627 0.7 Concentration (м) 0.000 1x10-3 2x10-3 3x10 3 4x10-3 5x10~3 6x10-3 7x10-3 8x1 Plot Absorbance vs. Concentration and calculate the molar absorptivity coefficient from the slope if the a)...

The measured absorbance of the solution of a substance A was 0.65. What was the concentration...

The measured absorbance of the solution of a substance A was 0.65. What was the concentration of substance A, if the thickness of cuvette was 1 cm, and molar absorption coefficient of this substance was 650 [dm3/mol cm]?