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# Chapter 31 Appendix G: Physical Constants and Conversion Factors

Selected Physical Constants
Atomic mass unit 1 amu = 1.6605389 × 10−24 g
1 g = 6.022142 × 1023 amu
Avogadro’s number N = 6.022142 × 1023/mol
Boltzmann’s constant k = 1.380651 × 10−23 J/K
Charge on electron e = 1.6021765 × 10−19 C
Faraday’s constant F = 9.6485338 × 104 C/mol
Gas constant R = 0.0820575 (L atm)/(mol K)
= 8.31447 J/(mol K)
Mass of electron me = 5.485799 × 10−4 amu
= 9.109383 × 10−28 g
Mass of neutron mn = 1.0086649 amu
= 1.6749273 × 10−24 g
Mass of proton mp = 1.0072765 amu
= 1.6726217 × 10−24 g
Pi π = 3.1415927
Planck’s constant h = 6.626069 × 10 −34J s
Speed of light (in vacuum) c = 2.99792458 × 108 m/s (exact)
Useful Conversion Factors and Relationships
Length Energy (derived)
Si unit: meter (m) Si unit: joule (J)
Mass Pressure (derived)
SI unit: kilogram (kg) SI unit: pascal (Pa)
Temperature Volume (derived)
Si unit: kelvin (K) SI unit: cubic meter (m 3 )