# Constants and Conversion Factors

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Constants and Conversion Factors

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• ## CONSTANTS

 1 bohr = 0.529177249 angstroms 1 atomic mass unit = 1.6605402 x 10-27 kilograms I electron charge = 1.602188 x 10-19 coulombs Planck's constant (h) = 6.6260755 x 10-34 joule-seconds Avogadro's number = 6.0221367 x 1023 I calorie = 4.184 joules 1 hartree = 4.3597482 x 10-18 joule Speed of light (c) = 2.99792458 x 1010 centimeters/second Boltzmann's constant (K) = 1.380658 x 10-23 joule/degree Molar volume of ideal gas at 273.15 K = 0.022241 cubic meters

# CONVERSION FACTORS

 1 electron mass = 0.9105953 x 10-30 kilograms 1 amu = 1822.8880 electron mass 1 electron volt (eV) = 23.06035 kilocalories/mole I hartree = 27.2116 eV I bohr-electron = 2.541765 Debye

# CONVERSION FACTORS FOR ENERGY UNITS

### Eh

#### 1 joule

1 6.022137*1020 6.241506*1018 2.293710*1017

#### 1 kJ*mol-1

1.660540*10-21 1 1.036427*10-2 3.808798*10-4

#### 1 eV

1.602177*10-19 96.4853 1 3.674931*10-2

#### 1 Eh

4.359748*10-18 2625.500 27.2114 1