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Calculate the fraction of atom sites that are vacant for silver at 687°C. Assume an energy for vacancy formation of 0.63 eV/atom.
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- Calculate the fraction of atom sites that are vacant for lead (Pb, Z = 82) at its melting temperature (327 degrees C). Assume that the energy for vacancy formation is 0.55 eV/atom. Calculate the fraction of vacant sites at room temperature (25 degrees C). What is the ratio of these two values?Calculate the number of vacancies per cubic meter for some metal, M, at 765°C. The energy for vacancy formation is 0.81 eV/atom, while the density and atomic weight for this metal are 7.26 g/cm3 (at 765°C) and 70.33 g/mol, respectively.Calculate the energy (in eV/atom) for vacancy formation in some metal, M, given that the equilibrium number of vacancies at 343oC is 9.39 × 1023 m-3. The density and atomic weight (at 343°C) for this metal are 7.75 g/cm3 and 142.6 g/mol, respectively.
- 1. Aluminum: [Ne] 3s² 3p¹ 2. Calcium: [Ar] 4s² 3.Copper: [Ar] 3d¹⁰ 4s¹ order these based on theNoble gas electron configuration by filling order:The number of vacancies in some hypothetical metal increases by a factor of 3 when the temperature is increased from 940 ˚C to 1130 ˚C. Calculate the energy for vacancy formation (in J/mol) assuming that the density of the metal remains the same over this temperature range.Calculate the number of Frenkel defects per cubic meter in Al2O3 if the energy required to create a Frenkel defect is 1.75 eV at 410 oC . The density of Al2O3 is 3.27 g/cm3. ( Use the exact values of the atomic weights of the elements)
- Why are the observed configurations of, for example, trigonal bipyramidal structures sometimes different for different measuring techniques?Define the following terms:Tyndall scattering: Polarization of Radiation:How many unpaired electrons would you expect for manganese in KMnO4? Is this a paramagnetic or diamagnetic material?
- Which of the following statements is true about diamagnetic solids? a. Have atoms with randomly orientated magnetic moments b. Are slightly attracted to a magnetic field c. Are strongly attracted to a magnetic field d. Have atoms with one or more unpaired electronsWhy is the electronic configuration of the yttrium atom [Kr]4d15s2 and that of the silver atom [Kr]4d105s1?The standard enthalpy of formation of O(g) is 249 kJ/mol. Calculate the wavelength (in nm) of the electromagnetic radiation with the minimum amount of energy required for dissociation of one molecule of oxygen gas.