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For materials in which the bonding is metallic, there are no restrictions as to the number and position of nearest-neighbor atoms. T/F
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- The atomic number of iron and nickle is 26 and 28 respectively. Give the electronic configuration of the following ions : Ni2+ , Fe3+a. Use a Haber cycle to show that CaCl has an exothermic enthalpy of formation. Use Kapustinskii to estimate the lattice energy. b. Show that CaCl does not exist because the enthalpy for the disproportionation reaction is favorable: 2CaCl(s) Ca(s) + CaCl2(s)To explain why AHan for RbCl is different than that for KCI, the student investigates factors that affect AHoln and finds that ionic radius and lattice enthalpy (which can be defined as the AH associated with the separation of a solid crystal into gaseous ions) contribute to the process. The students consults references and collects the data shown in the table below. lonic Radius (pm) lon к' 138 Rb* 152 b. Using principles of atomic structure, explain why the Rb' ion is larger than the K' ion
- Calculate the lattice enthalpy (DeltaH in kJ/mol) of the MF2 metal fluoride using the following data: Bond dissociation enthalpy of F2(g)=159 kJ/mol Electron affinity of F = -328 kJ/mol Enthalpy of sublimation of M = 108 kJ/mol First ionization energy of M = 412 kJ/mol Second ionization energy of M = 716 kJ/mol Standard enthalpy of formation of MF2(s) = -376 kJ/molWrite the ground-state electron configuration for each atomand ion pair-Zr, Zr2+, Co, Co2+, Tc, Tc3+, Os, Os4+?Iron can form a +3 ion. How many unpaired electrons are in Fe3+?
- Given the following information, use the Kapustinskii equation (shown below and included in the additional information sheet I encouraged you to download and have available) to calculate the lattice energy for Cr2S3 in kJ/mol. Ionic radii: Cr3+ (62 pm), S2− (184 pm) d* = 34.5 pm Κ = 1.21 × 105 kJ pm/molWrite electron configurations for the following ions. Ru3+ As3- Y3+ Pd2+The Pauling electronegativity of Cl is 3.2 while that of Br is 3.0. Estimate the bond dissociation energy of D(CI-Br) bond in kJ/mol. (given: D(Br-Br)=158 kJ/mol, D(CI- CI)=242 kJ/mol.) (1.0 eV = 96.5 kJ/mol). O 204 196 219 228 O 237
- In XCI, which crystallizes in CSCI structure, the sum of the anionic and cationic radii is found to be 318 pm. The density of the compound is 7.799 g cm. Calculate the mass of the cation as g mol. Do not write units, only enter numerical values. Use two digits at most for decimal numbers, use dot (.) as decimal separator (i.e. two-point-fifty-one should be entered as 2.51). Do not use comma (,) as decimal separator.The percent ionic character of a bond between elements A and B may be approximated by the expression %IN = 100[1 - e^(-1/4(XA - XB))], where XA and XB are the electronegavities for the respective elements. What is the the percent ionic character of the interatomic bonds for Fe2O3? What type of bonding would you expect in Fe2O3? Note: Use 1.8 for the electronegativity for Fe and 3.5 for the electronegativity for O.paramagnetism is present when an element, ion or molecule has unpaired electrons? true or false and why