p42_025 - 3 25. (a) According to Appendix F the molar mass...

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25. (a) According to Appendix F the molar mass of silver is 107 . 870 g / mol and the density is 10 . 49 g / cm 3 . The mass of a silver atom is 107 . 870 × 10 3 kg / mol 6 . 022 × 10 23 mol 1 =1 . 791 × 10 25 kg . 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 to n = ρ M = 10 . 49 × 10 3 kg / m 3 1 . 791 × 10 25 kg =5 . 86 × 10 28 m 3 . (b) The Fermi energy is E F = 0 . 121 h 2 m n 2 / 3 = (0 . 121)(6 . 626 × 10 34 J · s) 2 9 . 109 × 10 31 kg (5
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