Page 172 - Basic physical chemistry for the atmospheric sciences

Appendix I I . Some use u l numerical values
f

Universal constants
Universal gas constant - in SI units
(R*) 8 . 3 1 4 3 J deg - • mo1 - 1
Universal gas constant - in "chemi-
g
cal units" (R:) 0.082 1 L atm de - • mo1 - 1
Boltzmann constant (k) 1 . 3 8 1 x 10 - 2 3 J de - g • molecule - •
Avogadro's number (NA) 6.022 x 1 0 2 3 molecules mol - 1
v
Faraday constant (F) 96,489 C equi - •
Planck constant (h) 6.6262 x 1 0 - 34 J s
Velocity of light in a vacuum (c) 2.998 x 1 0 8 m s - 1
Other values
Number of molecules in I m3 of a
gas at 1 atm and 0°C (Loschmidt
number) 2.69 x 1025 molecules m - 3
Volume of 1 mole of an ideal gas at
0°C and 1 atm 22. 4 1 5 L
Ion-product constant for water at
25°C and 1 atm (Kw) 1 . 00 x 1 0 - 14 mol2 L 2
-
Conversion factors
1 bar = 105 Pa
I atm = 1 . 0 1 3 bar = 760.0 Torr
I ppm0 = 2.46 x 1019 molecules m - 3 = 4 0.9 (molecular weight of species) µg
m - 1
For a second-order rate coefficient: 1 cm3 s - 1 molecule - 1 = 6.02 x 1 0 20 liter
s - 1 mo1 - 1
For a third-order rate coefficient: I cm6 s - 1 molecuJe - 2 = 3.63 x 1 0 41 liter 2 s - 1
mo1 - 2
1 kcal moJ - 1 = 4. 8 kJ moJ - 1
1
1 eV 9 6.489 kJ moJ - 1
=
In x = 2 . 3 026 log x
a For a gas by mass relative to air at 1 atm and 25°C . Note: I ppb = 1 0 - 3 ppm
and I ppt = 1 0 - 6 ppm.

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