Chemistry 300L
Analytical Chemistry
EXAMINATION
SUPPLEMENTARY MATERIALS
for Exam 3
Some Constants of Interest
F
= 9.649
×
10
4
coulombs/mol
R
= gas constant = 8.314
J/K·mol
or
volt·coulombs/K·mol
=
N
A
k
B
Plank’s Constant is 6.626 x 10
−
34
J
s
Speed of light is 2.997 x 10
8
m
s
−
1
Avogadro’s Number,
N
A
, is 6.022 x 10
23
mol
−
1
Boltzmann’s constant,
k
B
,
is 1.381 x 10
−
23
J
K
−
1
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Supplementary Materials for Exam 3
page 2
Chapter 18
‐
20 Equations
Properties of Light
νλ
= c
in vacuum
= c/n
in a medium with refractive index
n
E = h
ν
where
is frequency in Hertz (cycles per second) s
−
1
hc
E
hcv
λ
==
where
=
1/
almost always wavenumbers, 1/centimeters, cm
−
1
Transmittance:
T
=
P/P
0
where
P
= irradiance (intensity)
A
=
log
=
log
P
o
P
1
T
=
−
log
T
=
ε
b
c
Absorbance:
Fourier Transform Spectroscopy
Spectral width
(
SW
) ~ maximum frequency measurable in spectrum (cm
−
1
for IR, s
−
1
(Hz) for NMR
):
1
2
SI
2
()
i
i
=
ss
r
−
∑
SI
1
2
SR
SW
=
or
SW
=
,
where
SR
=
,
2 points/Hz are necessary to
characterize a given frequency,
SI
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 '08
 FLOOD,HAW
 Analytical Chemistry, Light, Hertz, Analytical Chemistry EXAMINATION, FTNMR

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