Homework Answers
Add Answer to:
need help
C) Determine the concentration of methylene blue solution that has an absorbance 0.615 when...
Calculate the expected absorbance of solution of a 5.50x10-6 M solution of Blue # measured at...
Calculate the expected absorbance of solution of a 5.50x10-6 M solution of Blue # measured at 629 nm in a 1.50cm cell. The molar absorptivity for Blue #1 is 1.30×105 M-1cm-1 at 629 nm 4. A 2.50x10-5 M solution of a specific dye has an absorbance value of 1.300 when measured at 525 nm in a cell with a path length of 2.00 cm. Calculate the molar absorptivity of this dye at this wavelength 5.
An aspirin solution of unknown concentration was studied using ultraviolet spectroscopy. This solution had a percent...
An aspirin solution of unknown concentration was studied using ultraviolet spectroscopy. This solution had a percent transmittance of 37.3 when measured at 273 nm in a 1.000-cm cell. Aspirin is known to have a molar absorptivity of 741 M-1cm-1 at this wavelength. a. Calculate the absorbance of this solution b. What is the concentration of aspirin in this solution? c. What would be the absorbance of a solution prepared by taking 10.00mL of this solution and diluting to 100.00mL in...
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)
need help b) Potassium dichromate K2Cr207 absorbs light at a wavelength of 345nm. A solution of...
need help
b) Potassium dichromate K2Cr207 absorbs light at a wavelength of 345nm. A solution of potassium dichromate with chromium concentration of 40.0mg/L gave an absorbance of 0.412 when measured using a 1cm cell. What is the molar absorptivity (give units) of potassium dichromate K2Cr207 at this wavelength? (hint: need to convert concentration to moles/L)
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!!
I need help with 5 & 7 please (a) 15.8% (d) 23.8% (b) 0.492 (e) 0.085...
I need help with 5 & 7 please
(a) 15.8% (d) 23.8% (b) 0.492 (e) 0.085 (c) 39.4% (f) 5.38% *13-3 Calculate the percent transmittance of solutions having half the abse solutions in Problem 13-1. f the absorbance of the cent transmittance of *13-4 Calculate the absorbance of solutions having twice the percent transmiti those in Problem 13-2. *13-5 A solution containing 6.23 ppm KMnO, had a transmittance of 0.195 in a 10 cell at 520 nm. Calculate the molar...
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....
LAB #7 Kinetics: Oxidation of Organic Dye Molecules 40.0 mL of DI water is added to...
LAB #7 Kinetics: Oxidation of Organic Dye Molecules 40.0 mL of DI water is added to 10.0 mL of a brilliant blue solution to dilute it. The absorbance at λ = 630 nm of the diluted brilliant blue solution is measured to be 0.452. Using the molar absorptivity coefficient (ε) that you measured in part I of today’s lab, what is the concentration of the undiluted brilliant blue solution? Show your work. Molar absorptivity coefficient = 138,328 M-1cm-1 path length=...
A solution of a specific vitamin has a Imax of 287 nm and a concentration of...
A solution of a specific vitamin has a Imax of 287 nm and a concentration of 4.93 x 10-7M. The absorbance of the solution at 287 nm is A = 0.135. What is the molar absorptivity of the vitamin at 287 nm? A sample path length is 1.00 cm. molar absorptivity: L mol-'cm-1
A student measures the absorbance of a solution at some point during the reaction and records...
A student measures the absorbance of a solution at some point during the reaction and records a value of 0.335 . (Note that absorbance has no units.) Use Beer's Law and the constants given on page 5 to calculate the concentration of crystal violet in this solution. *The relationship between the solution absorbance and the CV+ concentration can be written as shown in Equation 7 below (Beer’s Law). At = ε∙b∙ct [7] In Equation 7, At is the reaction solution...
Calculate the expected absorbance of solution of a 5.50x10-6 M solution of Blue # measured at 629 nm in a 1.50cm cell. The molar absorptivity for Blue #1 is 1.30×105 M-1cm-1 at 629 nm 4. A 2.50x10-5 M solution of a specific dye has an absorbance value of 1.300 when measured at 525 nm in a cell with a path length of 2.00 cm. Calculate the molar absorptivity of this dye at this wavelength 5.
need help
b) Potassium dichromate K2Cr207 absorbs light at a wavelength of 345nm. A solution of potassium dichromate with chromium concentration of 40.0mg/L gave an absorbance of 0.412 when measured using a 1cm cell. What is the molar absorptivity (give units) of potassium dichromate K2Cr207 at this wavelength? (hint: need to convert concentration to moles/L)
I need help with 5 & 7 please
(a) 15.8% (d) 23.8% (b) 0.492 (e) 0.085 (c) 39.4% (f) 5.38% *13-3 Calculate the percent transmittance of solutions having half the abse solutions in Problem 13-1. f the absorbance of the cent transmittance of *13-4 Calculate the absorbance of solutions having twice the percent transmiti those in Problem 13-2. *13-5 A solution containing 6.23 ppm KMnO, had a transmittance of 0.195 in a 10 cell at 520 nm. Calculate the molar...
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....
A solution of a specific vitamin has a Imax of 287 nm and a concentration of 4.93 x 10-7M. The absorbance of the solution at 287 nm is A = 0.135. What is the molar absorptivity of the vitamin at 287 nm? A sample path length is 1.00 cm. molar absorptivity: L mol-'cm-1
Most questions answered within 3 hours.
-
Assume memory access is 10 units of time and disk access is
10000 units of time....
asked 6 seconds ago -
1. Are all good samples random?
2. Magazines often report surveys giving statistics such as “63%...
asked 21 minutes ago -
Under all the various types of market structures, firms
must eventually earn some economic profits for...
asked 7 minutes ago -
Consider the following fitness regime for a single locus trait
with two co-dominant alleles: w11 =...
asked 12 minutes ago -
A large cable company reports the following.
80% of its customers subscribe to its cable TV...
asked 27 minutes ago -
Please answer the question in brief.
Discuss the role of ERP in organizations. Are ERP tools...
asked 13 minutes ago -
Discuss the pros and cons of collaborative software such
as SameTime. Does it increase productivity? What...
asked 26 minutes ago -
Buying your in-laws a gift because it’s expected is
due to the ____________ motive of gift-giving....
asked 29 minutes ago -
Calculate the expected value, the variance, and the standard
deviation of the given random variable X....
asked 1 hour ago -
A hospital performs 100 surgeries per week. The probability that
complications after surgery occur is 10%....
asked 1 hour ago -
1 point) Given the significance level α=0.01 find the following:
(a) left-tailed z value z= (b)...
asked 1 hour ago -
Assuming you are the head of the software development unit at
Cyber.Soft, explain and justify why...
asked 36 minutes ago