Question
In: Chemistry
The following information is to be used for the next two questions. Molar absorptivity data for...
The following information is to be used for the next two questions. Molar absorptivity data for the cobalt and nickel complexes with 2,3-quinoxalinedithiol are εCo = 36400 and εNi = 5520 at 510 nm and εCo = 1240 and ε Ni = 17500 at 656 nm. A 0.583-g sample was dissolved and diluted to 200.0 mL. A 25.0-mL aliquot was treated to eliminate interferences; after addition of 2,3-quinoxalinedithiol, the volume was adjusted to 50.0 mL. This solution had an absorbance of 0.709 at 510 nm and 0.505 at 656 nm in a 1.00-cm cell.
a). Calculate the concentration of cobalt (in ppm) in the initial solution prepared by dissolving the sample.
b). Calculate the concentration of nickel (in ppm) in the initial solution prepared by dissolving the sample.
Solutions
queen_honey_blossom answered 2 years agoRelated Solutions
The following information is to be used for the next two questions. Molar absorptivity data for...
The following information is to be used for the next two
questions. Molar absorptivity data for the cobalt and nickel
complexes with 2,3-quinoxalinedithiol are εCo = 36400
and εNi = 5520 at 510 nm and εCo = 1240 and ε
Ni = 17500 at 656 nm. A 0.445-g sample was dissolved and
diluted to 250.0 mL. A 25.0-mL aliquot was treated to eliminate
interferences; after addition of 2,3-quinoxalinedithiol, the volume
was adjusted to 50.0 mL. This solution had an absorbance...
The following information is to be used for the next two questions. Molar absorptivity data for...
The following information is to be used for the next two
questions. Molar absorptivity data for the cobalt and nickel
complexes with 2,3-quinoxalinedithiol are εCo = 36400 and εNi =
5520 at 510 nm and εCo = 1240 and ε Ni = 17500 at 656 nm. A 0.556-g
sample was dissolved and diluted to 150.0 mL. A 25.0-mL aliquot was
treated to eliminate interferences; after addition of
2,3-quinoxalinedithiol, the volume was adjusted to 50.0 mL. This
solution had an absorbance...
The following information is to be used for the next two questions. Molar absorptivity data for...
The following information is to be used for the next two
questions. Molar absorptivity data for the cobalt and nickel
complexes with 2,3-quinoxalinedithiol are εCo = 36400 and εNi =
5520 at 510 nm and εCo = 1240 and ε Ni = 17500 at 656 nm. A 0.514-g
sample was dissolved and diluted to 150.0 mL. A 25.0-mL aliquot was
treated to eliminate interferences; after addition of
2,3-quinoxalinedithiol, the volume was adjusted to 50.0 mL. This
solution had an absorbance...
Molar absorptivity data for the cobalt and nickel complexes with 2,3-quinoxalinedithiol are εCo = 36400 and...
Molar absorptivity data for the cobalt and nickel complexes with
2,3-quinoxalinedithiol are εCo = 36400 and
εNi = 5520 at 510 nm and εCo = 1240 and ε
Ni = 17500 at 656 nm. A 0.322-g sample was dissolved and
diluted to 250.0 mL. A 25.0-mL aliquot was treated to eliminate
interferences; after addition of 2,3-quinoxalinedithiol, the volume
was adjusted to 50.0 mL. This solution had an absorbance of 0.650
at 510 nm and 0.588 at 656 nm in a...
The following scenario will be used for the next four questions. Operating data for the Abraham...
The following scenario will be used for the next four questions.
Operating data for the Abraham Company for fiscal 2017 are
presented below. Abraham has one building, and the space in the
building is divided about equally between manufacturing and
retailing. Approximately 20% of the labor costs incurred in
manufacturing are for supervisory labor, and the remaining 80% of
the salaries are paid to employees directly engaged in
manufacturing jobs for clients.
Purchases of raw material in 2017 $220,000
Manufacturing...
What part of the spectra out provides information about the identity of the compound? Molar Absorptivity,...
What part of the spectra out provides information about the
identity of the compound?
Molar Absorptivity, Transmission , Absorbance, Wavelength
What part of the spectra out provides information about the
quantity of the compound?
Molar Absorptivity, Transmission , Absorbance, Wavelength
How is the measured quantity, transmittance, related to the
calculated quantity, absorbance?
Absorbance = 1/transmittance, Absorbance = e^(transmittance) ,
Absorbance = transmittance, Absorbance = -log(transmittance)
How is absorbance related to concentration (the symbol α means
proportional to)?
Absorbance α concentration,...
P23-27: Molar absorptivity data for the cobalt and nickel complexes with 2,3- quinoxalinedithiol are εCo =...
P23-27: Molar absorptivity data for the cobalt and
nickel complexes with 2,3-
quinoxalinedithiol are εCo = 36,400 and εNi = 5520 at 510 nm and
εCo = 1240 and εNi = 17,500 at 656 nm. A 0.425-g sample was
dissolved and diluted to 50.0 mL. A 25.0-mL aliquot was treated to
eliminate interferences; after addition of 2,3quinoxalinedithiol,
the volume was adjusted to 50.0 mL. This solution had an absorbance
of 0.446 at 510 nm and 0.326 at 656 nm in...
The next four questions refer to the following information: Two methods, A and B, are available...
The next four questions refer to the following information: Two
methods, A and B, are available for teaching a certain industrial
skill. There is a 95% chance of successfully learning the skill if
method A is used, and an 80% chance of success if method B is used.
However, method A is substantially more expensive and is therefore
used only 25% of the time (method B is used the other 75% of the
time). The following notations are suggested: A—method...
Use the following information to answer the next two questions: Stock Amount &nb
Use the
following information to answer the next two
questions:
Stock
Amount
Beta
A
25,000
0.2
B
20,000
1.0
C
30,000
1.8
D
25,000
1.6
Risk-free rate is
3% and the market risk premium is 8%
What is the required return for this portfolio?
A.) Use the following information for the next two questions. Suppose the risk free rate is...
A.) Use the following information for the next two questions.
Suppose the risk free rate is 4%. Consider the following three
borrowers: A, B, and C. Their probability of repayment (p) is .95,
.92, and .90, respectively, with associated gammas of .3, .4, and
.6, respectively. Where gamma = % recovery in event of default.
Which borrower would be charged the highest loan rate?
B.) How much would A's loan rate increase if the loan was
unsecured?
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