A quantity of any substance equal to its molecular weight in grams is a mole of that substance contains the same number of molecules as one mole of any other substance. This Avogadro's number and equals 6.02 x 10
23 molecules per mole. Thus
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= 9.03 x 1028 electrons/m3
Since for tungsten the atomic and the molecular weights are the same. Therefore for tungsten
EF = 3.64 x 10-19(η)2/3
= 3.64 x 10- 19(9.03 x 1028)2/3
EF = 7.326 eV.
