One series of lines of the hydrogen spectrum is caused bye mission of energy accompanying the fall of an electron from outer shells to the third shell. The lines can be calculated using the Balmer—Rydberg equation: 1 λ = R ∞ [ 1 m 2 − 1 n 2 ] where m = 3 , R ∞ = 1.097 × 10 − 2 nm − 1 , and n is an integer greater than 3. Calculate the wavelengths in nanometers and energies in kilojoules per mole of the first two lines in the series. In what region of the electromagnetic spectrum do they fall?
One series of lines of the hydrogen spectrum is caused bye mission of energy accompanying the fall of an electron from outer shells to the third shell. The lines can be calculated using the Balmer—Rydberg equation: 1 λ = R ∞ [ 1 m 2 − 1 n 2 ] where m = 3 , R ∞ = 1.097 × 10 − 2 nm − 1 , and n is an integer greater than 3. Calculate the wavelengths in nanometers and energies in kilojoules per mole of the first two lines in the series. In what region of the electromagnetic spectrum do they fall?
Solution Summary: The author explains how the Rydberg constant can be used to calculate the energy and wavelength of absorbing or emitting radiations for the lines in the spectral series.
One series of lines of the hydrogen spectrum is caused bye mission of energy accompanying the fall of an electron from outer shells to the third shell. The lines can be calculated using the Balmer—Rydberg equation:
1
λ
=
R
∞
[
1
m
2
−
1
n
2
]
where
m
=
3
,
R
∞
=
1.097
×
10
−
2
nm
−
1
, and n is an integer greater than 3. Calculate the wavelengths in nanometers and energies in kilojoules per mole of the first two lines in the series. In what region of the electromagnetic spectrum do they fall?
Using the Nernst equation to calculate nonstandard cell voltage
A galvanic cell at a temperature of 25.0 °C is powered by the following redox reaction:
MnO2 (s)+4H* (aq)+2Cr²+ (aq) → Mn²+ (aq)+2H₂O (1)+2Cr³+ (aq)
+
2+
2+
3+
Suppose the cell is prepared with 7.44 M H* and 0.485 M Cr²+ in one half-cell and 7.92 M Mn² and 3.73 M Cr³+ in the other.
Calculate the cell voltage under these conditions. Round your answer to 3 significant digits.
☐
x10
μ
Х
5
?
000
日。
Calculating standard reaction free energy from standard reduction...
Using standard reduction potentials from the ALEKS Data tab, calculate the standard reaction free energy AG° for the following redox reaction.
Be sure your answer has the correct number of significant digits.
NO (g) +H₂O (1) + Cu²+ (aq) → HNO₂ (aq) +H* (aq)+Cu* (aq)
kJ
-
☐ x10
x10
olo
18
Ar
Calculating the pH of a weak base titrated with a strong acid
b
An analytical chemist is titrating 116.9 mL of a 0.7700M solution of aniline (C6H5NH2) with a 0.5300M solution of HNO3. The pK of aniline is 9.37.
Calculate the pH of the base solution after the chemist has added 184.2 mL of the HNO 3 solution to it.
Note for advanced students: you may assume the final volume equals the initial volume of the solution plus the volume of HNO3 solution added.
Round your answer to 2 decimal places.
pH = ☐
☑
5
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Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell
Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell