Homework Answers
A = e*l*c
Where
A is absorbance
l is path length
c is concentration
e is molar absorptivity
Given:
A = 0.753
l = 1 cm
c = 3.42*10^-5 M
Use:
A = e*l*c
0.753= e*1*3.42*10^-5
e = 2.202*10^4 M-1.cm-1
Answer: 2.20*10^4 M-1.cm-1
Add Answer to:
8) A 3.42 x 10-5 M solution of dibenzalacetone in ethanol produced an absorbance of 0.753...
2. The absorbance of a 2.31 % 10 M solution of a compound is 0.822 at...
2. The absorbance of a 2.31 % 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. The following absorption data were calculated in an experiment: Absorbance 0.000 0.00 0.181 0.271 0.361 0.450 0.539 0.627 0.7 Concentration 0.000 1x10-3 2x10-3 3x10-3 4x10- 5x10- 6x10 3 7x10- 8x1 (M) Plot Absorbance vs. Concentration and a) calculate the molar absorptivity coefficient from the slope if the...
A solution containing a mixture of the compounds X and Y had an absorbance of 0.906...
A solution containing a mixture of the compounds X and Y had an absorbance of 0.906 at 443 nm and an absorbance of 0.778 at 520 nm when measured with a 1.00 cm cell. The molar absorptivities (ε) of X and Y at each wavelength are shown in the table below. wavelength Molar Absorptivity (E M^-1cm^-1) Lambda,nm X Y 443 1.600x10^4 3775 520 3893 6264 What are the Concentration of X and Y. Thank you!!
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)...
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
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....
Molar absorptivity for acetylsalicylic acid solution in 50% ethanol is 1120 at 276 nm. Calculate the...
Molar absorptivity for acetylsalicylic acid solution in 50% ethanol is 1120 at 276 nm. Calculate the absorbance of a 2.00 ×10^-4 M solution of this compound complex in a 2.00 cm cell.
Questions 7-10 concern the [Fe(SCN)2l+ complex that has a molar absorptivity ε = 7.00x103 M-1cm-1 at...
Questions 7-10 concern the [Fe(SCN)2l+ complex that has a molar absorptivity ε = 7.00x103 M-1cm-1 at 580 nm (maximum absorption wavelength). Final answer: 7. Calculate the absorbance of a 2.50 x 10-5 M solution of the complex at 580 nm in a 1.00-cm cell. Final answer: 8. Calculate the absorbance of a solution in which the concentration of the complex is twice that in Question 6. Final answer: 9. Calculate the transmittance of the solution described in Question 7? Final...
Please show work! A solution containing a mixture of the compounds X and Y had an absorbance of 1.06 at 443 nm and...
Please show work!
A solution containing a mixture of the compounds X and Y had an absorbance of 1.06 at 443 nm and an absorbance of 0.909 at 520 nm when measured with a 1.00 cm cell. The molar absorptivities (C) of X and Y at each wavelength are shown in the table. Wavelength (2. nm) Molar Absorptivity (M 'cm ) 3507 443 520 14860 3616 5818 What are the concentrations of X and Y in this mixture? Transmittance (%)...
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 8.96 × 10−4 M solution of compound A exhibited an absorbance of 0.674 at 238...
A 8.96 × 10−4 M solution of compound A exhibited an absorbance of 0.674 at 238 nm in a 1.000-cm cuvet; a blank solution containing only solvent had an absorbance of 0.029 at the same wavelength. Find the molar absorptivity of compound A. When a molecule absorbs the energy of a photon of 480 nm wavelength, what types of processes account for the absorption?
2. The absorbance of a 2.31 % 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. The following absorption data were calculated in an experiment: Absorbance 0.000 0.00 0.181 0.271 0.361 0.450 0.539 0.627 0.7 Concentration 0.000 1x10-3 2x10-3 3x10-3 4x10- 5x10- 6x10 3 7x10- 8x1 (M) Plot Absorbance vs. Concentration and a) calculate the molar absorptivity coefficient from the slope if the...
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)...
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
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....
Questions 7-10 concern the [Fe(SCN)2l+ complex that has a molar absorptivity ε = 7.00x103 M-1cm-1 at 580 nm (maximum absorption wavelength). Final answer: 7. Calculate the absorbance of a 2.50 x 10-5 M solution of the complex at 580 nm in a 1.00-cm cell. Final answer: 8. Calculate the absorbance of a solution in which the concentration of the complex is twice that in Question 6. Final answer: 9. Calculate the transmittance of the solution described in Question 7? Final...
Please show work!
A solution containing a mixture of the compounds X and Y had an absorbance of 1.06 at 443 nm and an absorbance of 0.909 at 520 nm when measured with a 1.00 cm cell. The molar absorptivities (C) of X and Y at each wavelength are shown in the table. Wavelength (2. nm) Molar Absorptivity (M 'cm ) 3507 443 520 14860 3616 5818 What are the concentrations of X and Y in this mixture? Transmittance (%)...
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...
Most questions answered within 3 hours.
-
Where is the error in this code sequence?
String s1 = "Hello";
String s2 = "ello";...
asked 11 months ago -
Financial data for Joel de Paris, Inc., for last year
follow:
Joel de Paris, Inc.
Balance...
asked 11 months ago -
Consider this reaction:
Al2(SO4)3 (aq)+ BaCl3
(aq) Al2Cl6 (aq)- +
3BaSO4(s) . What is the...
asked 11 months ago -
Suppose that Savneet is considering increasing her
recent random sample from 20 car rentals to 40...
asked 11 months ago -
Trucks arrive at an unloading terminal at an average rate of 120
per hour.
Trucks arrive...
asked 11 months ago -
Why are methanol and ethanol completely soluble in water while
octanol is not very little soluble....
asked 11 months ago -
A facilities manager at a university reads in a research report
that the mean amount of...
asked 11 months ago -
When the CuSO4 is rehydrated by adding water to the anhydrous
compound, is this an endothermic...
asked 11 months ago -
A ray of sunlight is passing from diamond into crown glass; the
angle of incidence is...
asked 11 months ago -
A block of mass 0.249 kg is placed on top of a light, vertical
spring of...
asked 11 months ago -
how do the kidneys compensate in the presences of acidosis
a) trigger hyperventilate
b) reserve acid...
asked 11 months ago -
Question 501 pts
The rental rate of capital to the firm increases. Which of the
following...
asked 11 months ago