Example : CaCl2 ( s ) Ca2 + ( g ) + 2C1- ( g ). A copy of the license is included in the section entitled GNU Free Documentation License.Standard enthalpy of formation ( $ \Delta H_f^o $ ) = lattice energy + (2 $ \times $ Electron affinity for chlorine) + Bond Energy of Chlorine gas + first and second ionisation energy of calcium + Sublimation energy of Calcium solid. Calculate the lattice energy of CaCl 2 using a Born-Haber cycle and data from Appendices F and L and Table 7.5. Calculate the lattice enthalpy of CaCl2, given that the enthalpy of (i) sublimation of Ca is 121 kJ/mol (ii) dissociation of Cl2 to Cl is 242.8 kJ/mol (iii). Lattice enthalpy is the standard enthalpy when a solid ionic lattice is broken into separate gaseous ions. The lattice energy is usually given in kilojules per mole (kJ/mol). Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. The lattice energy is the total potential energy of the crystal. ![]() CC BY-SA 3.0 Creative Commons Attribution-Share Alike 3.0 true true The lattice energy of CaCl2 is -2258 kJ / mol, and the total enthalpy of hydration of its ions is -2175 kJ / mol. Lattice energy is defined as the energy released during the conversion of gaseous ions into their corresponding solid ions. The electron affinity of chlorine, Cl - 349 kj/mole. share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original. The enthalpy of dissociation of chlorine, Cl2 + 243 kj/mole.You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use. The bond between ions of opposite charge is strongest when the ions are small. The lattice energy of NaCl, for example, is 787.3 kJ/mol, which is only slightly less than the energy given off when natural gas burns. 1st Ionization Energy of Ca 589.5 k J 2nd Ionization Energy of Ca 1145 k J Bond Energy of Cl2 242. ![]() The lattice energies of ionic compounds are relatively large. What is the lattice energy of CaCl 2 How to Calculate the Lattice Energy of CaCl 2: The Born-Haber cycle and Hesss Law can be used to calculate the lattice energy of an ionic crystal. attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. Standard enthalpy of formation ( Delta Hfo ) lattice energy + (2 times Electron affinity for chlorine) + Bond Energy of Chlorine gas + first and. Na + ( g) + Cl - ( g) NaCl ( s) Ho -787.3 kJ/mol. ![]() to share – to copy, distribute and transmit the work The calculated lattice energies are found to be UPOT(CaCl2) 2159 kJ mol1, UPOT(CaCl22H2O) 2320 kJ mol1, UPOT(CaCl24H2O) 2297 kJ mol1, UPOT(CaCl24H2O).
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