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?
4. Draw and label all possible isomers for [M(py)3(DMSO)2(CI)] (py = pyridine, DMSO
dimethylsulfoxide).
The emission data in cps displayed in Table 1 is reported to two decimal places by the
chemist. However, the instrument output is shown in Table 2.
Table 2. Iron emission from ICP-AES
Sample
Blank
Standard
Emission, cps
579.503252562
9308340.13122
Unknown Sample
343.232365741
Did the chemist make the correct choice in how they choose to display the data up in Table
1? Choose the best explanation from the choices below.
No. Since the instrument calculates 12 digits for all values, they should all be kept and not truncated.
Doing so would eliminate significant information.
No. Since the instrument calculates 5 decimal places for the standard, all of the values should be
limited to the same number. The other decimal places are not significant for the blank and unknown
sample.
Yes. The way Saman made the standards was limited by the 250-mL volumetric flask. This glassware
can report values to 2 decimal places, and this establishes our number of significant figures.
Yes. Instrumental data…
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