25. (a) According to Appendix F the molar mass of silver is 107.870 g/mol and the density is 10.49 g/cm3.The mass of a silver atom is107.870×10−3kg/mol6.022×1023mol−1=1.791×10−25kg.We note that silver is monovalent, so there is one valence electron per atom (see Eq. 42-2). Thus,Eqs. 42-4 and 42-3 lead ton=ρM=10.49×103kg/m31.791×1025kg=5.86×1028m−3.(b) The Fermi energy isEF=0.121h2mn2/3=(0.121)(6.626×10−34J·s)29.109×10−31kg(5
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