Calculate the fraction of lead vacancies in a piece of solid lead at 326°C. Assume an activation energy for vacancy formation 0.61 eV/atom. (k: 1.38*10-23 J/K, 1 joule: 6.24*10¹8 eV, dpb: 11.34 g/cm³, Mpb: 207.2 g/mol, N: 6.022*1023 1/mol)
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