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CHEMISTRY-TEXT
- Of the five elements Sn, Si, Sb, O, Te, which has the most endothermic reaction? (E represents an atom.) What name is given to the energy for the reaction? E(g)E+(g)+earrow_forwardWhich of the following compounds requires the most energy to convert one mole of the solid into separate ions? (a) MgO (b) SrO (c) KF (d) CsF (e) MgF2arrow_forwardCalculate the lattice energy of potassium fluoride, KF, using the BornHaber cycle. Use thermodynamic data from Appendix C to obtain the enthalpy changes for each step. (Note: You will obtain a slightly different answer if you use values given in Chapter 8 for the ionization energy and electron affinity, which are energy values at 0 K rather than the enthalpy changes at 298 K.)arrow_forward
- The ionic radii of element E and a different metallic element, M, are shown in the following table: Both elements form oxides, E2O and MO. If lattice energy is defined as the energy required to separate an ionic solid into individual separate gaseous ions, would the lattice energy of MO be less than, equal to, or greater than the lattice energy of the oxide E2O? Justify your answer in terms of Coulomb's lawarrow_forwardWhich compound in each of the following pairs of ionic substances has the most exothermic lattice energy? Justify your answers a. NaCl,KCI b. LiF,LiCl c.Mg(OH)2, MgO d. Fe(OH)2, Fe(OH)3arrow_forwardUsing the provided table and the equation below, determine the heat of formation for PbS. 2 PbS (s) + 3 O₂ (g) → 2 SO₂ (g) + 2 PbO (s) ∆H° = -828.4 kJ/molarrow_forward
- The lattice energy is defined as the energy required to break one mole of an ionic solid into its ions in the gas phase. The lattice energy for calcium oxide corresponds to the following reaction. CaO(s) Ca2+(g) + O2-(g) DH = ? Using the following information, determine the lattice energy for calcium oxide. Ca(s) ----> Ca(g) DH = 178.2 kJ Ca(g) ----> Ca2+(g) + 2e- DH = 1747.9 kJ O2(g) ----> 2O(g) DH = 498.3 kJ O2-(g) ----> O(g) + 2e- DH = -702 kJ Ca(s) + 1⁄2 O2(g) ----> CaO(s) DH = -635.0 kJ Using the unrounded answer from the previous problem determine q (kJ) for the following reaction when 1.00 grams of solid calcium oxide forms. Ca2+(g) + O2-(g) ⟶⟶ CaO(s)arrow_forwardChemistry Inorganic Chemistry Question 1 In a proccess of Lithium Chloride synthesis, the following experimental data were collected. Its lattice energy can be calculated from a Born-Haber cycle. Ionization energy of Li = +520 kJ mol Heat to convert Li(s) to Li(g) = +159 kJ mol Heat of formation of LiCl = -409 kJ mol Heat to convert Cl2(g) to Cl(g) = +122 kJ mol Electron affinity of chlorine atoms = -349 kJ mol (a) Using the state symbols (s), (l), (g) and the symbol for an electron, e-, write an equation in each case to define the following terms: (i) The first ionization energy of lithium. (ii) The heat of formation of lithium chloride. (iii) The electron affinity of chlorine. (iv) The lattice energy of lithium chloride. (b) Construct a labeled Born-Haber cycle for the formation of Lithium Chloride. (c) Show the calculation for the lattice energy of Lithium Chloride.arrow_forwardThe following compounds all display the NaCl structure.(i.e. They are isomorphous.) For each pair, indicate which would have the lattice energy of greater magnitude. CaTe CaO MgO BaO RbBr RbCl CaTe CaSe KI SrOarrow_forward
- Use the data provided below to calculate the lattice energy of RbCl. Is this value greater or less than thelattice energy of NaCl? Explain.Electron affinity of Cl = –349 kJ/mol1st ionization energy of Rb = 403 kJ/molBond energy of Cl2 = 242 kJ/molSublimation energy of Rb = 86.5 kJ/molΔHf [RbCl (s)] = –430.5 kJ/molarrow_forwardAn experiment was conducted to determine the Cl - Cl bond energy in chlorine. It was determined the minimum energy required to break a Cl - Cl bond was 3.90 x 10-19 J. According to these experimental results, what is the Cl - Cl bond energy (in kJ/mol)?arrow_forwardRank the following ionic compounds in order of lattice energy, from least exothermic to most exothermic: KCl, SrO, RbBr, CaOarrow_forward
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