Calculate the fraction of atom sites that are vacant for silver at (3.60x10^2) °C. Assume an energy for vacancy formation of (7.000x10^-1) eV/atom. Answer: (2.68x10^-6) The ratio, Xv, is the number of vacancies (N₂) over the number of atomic sites (M). Xv= = exp(-Q/KT).
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- Calculate the energy for vacancy formation in silver, given that the equilibriumnumber of vacancies at 800°C is 3.6x1023 m-3 . The atomic weight and density(at 800°C) for silver are, respectively, 107.9 g/mol and 9.5 g/cm3. (NA= 6.023x1023 atoms/mol)Ksp for Co(OH)2 is 5.92x10^-15Question 5: The Fermi energy of silver is 5.5 eV, and the relaxation time of electrons is 3.97 x 10 -14 s. Calculate. a) The electron concentration (n) in silver EF (3g² 213 %3D b) The Fermi velocity (VF) c) The mean free path (AF). for the electrons in silver d) The Fermi temperature (Tf) e) The Hall coefficient (RH). f) The electrical Conductivity (0). g) The thermal conductivity (K) of Aluminum at 300 K (Wiedemann-Franz-Lorenz coefficient L=2.44 x 10-8 W N K-2)
- Tron can be extracted from haematite, Fe,Oa, using either C or CO2 as the reducing agent. The reactions are shown below. AH = +492.7 kJ /mol %3D Fe2O3(s) + 3 C(s) → 2 Fe(s) + 3 CO(g) AH = - 24.8 kJ/mol Fe2O3(s) + 3 CO(g) → 2 Fe(s) + 3 CO2(g) Substance S° (J/ K•mol) Fe2O3 (s) 87.4 Fe (s) 27.3 C (s) 5.7 CO (g) 197.6 CO2 (g) 213.6 Use available data given to: 1. Calculate the minimum temperature at which reduction with carbon is feasible 4464. The common oxidation number for an alkaline earth metal is +2. (a) Using the Born-Mayer equation (for determining the lattice enthalpy) and a Born-Haber cycle (draw it), show that CaCl is an exothermic compound (negative AHf). Make a reasonable prediction to estimate the ionic radius of Ca (explain your reasoning). The sublimation (atomization) enthalpy for Ca(s) is 178 kJ/mol. (b) Show that an explanation for the non-existence of CaCl can be found in the enthalpy change for the reaction below. The AHf for CaCl2(s) is -190.2 kcal/mol. 2 CaCl(s) → Ca(s) + CaCl2(s)Plot the melting temperatures of elements in the 4A to 8–10 columns of the periodic table versus atomic number (i.e., plot melting temperatures of Ti through Ni, Zr through Pd, and Hf through Pt). Discuss these relationships, based on atomic bonding and binding energies: (a) as the atomic number increases in each row of the periodic table and (b) as the atomic number increases in each column of the periodic table.
- Given: 2H+(aq) + 2e– → H2(g); 0.00 VRb+(aq) + e– → Rb(s); –2.98 VF2(g) + 2e– → 2F–(aq); 2.87 VAl3+(aq) + 3e– → Al(s); –1.66 VPb2+(aq) + 2e– → Pb(s); –0.13 V Under standard-state conditions, which are the strongest reducing and oxidizing agents? Group of answer choices H+ and F2 Rb and Pb2+ Al3+ and F2 Rb and F2 Rb and F–#9. Conductor nanoparticle: The metal-to-semiconductor transition What diameter does a silver particle (a perfect sphere) achieve quantum confinement at room temperature (25°C)? A silver atom has the electronic configuration [Kr]4d105s', giving one valence electrons. The density of solid silver is 10.49 g/cm. Its atomic mass is 108 g/mol. The silver Fermi energy is 5.49 ev.Part B: Which of the following compounds are efflorescent, hygroscopic or neither? Nature of the compound as Efflorescent or Formula of Initial weight of Final weight of Increase or the compound decrease or NO with weighing change in mass boat/paper the compound the compound with weighing boat/paper hygroscopic or neither CaCl2 (anhydrous) NaOH 5.1428 5. 105g 4. 396g S.09181 5.218g (pellets) 4.9839 ZNSO4. 7H2O
- Rank the following in order of increasing(a) Melting point: Na, Si, Ar(b), ΔH(fus): Rb, Cs, LiMn^2+orbital filling diagram4.) Calculate the energy for vacancy formation in silver (in eV), given that the equilibrium number of vacancies at 8000 degrees celsius is 3.62 x 1023 m-3. Helpful info:Atomic weight of silver: 107.9 g/moleDensity of silver: 9.5 g/cm