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16 Nov 2019
The "Born - Haber cycle" (Lecture Notes section 3.2.2) can be used to find the "Lattice Energy" of ionic compounds. For the alkalimetal halide salts, we have data for the Enthalpy of Formation (Delta H_f degree) of the salt, the Enthalpy of Vapourization of the metal (Delta H_vap), the enthalpy of dissociation of the halogen (Delta_diss), the Ionization Energy (IE) of the metal in the gas phase, and the Electron Affinity (EA) of the halogen atom. These data can be found in Atkins Appendix Tables 2.7, 13a, 10.3 and 10.4. Using these data from Atkins, calculate the Lattice Energy of (each student to he assigned a different salt!). In your calculation, be careful with the sign and with the coefficients. For instance, IE and EA are always defined as positive, but in your calculation using the cycle, think of the sign for EA! Similarly, realize that Delta_diss. is for the halogen X_2 (gas, liquid or solid!). Delta G of a given reaction can be represented by Delta_G_rxn = - 75.4 + 46.5T (J). Calculate Delta S_nxm.
The "Born - Haber cycle" (Lecture Notes section 3.2.2) can be used to find the "Lattice Energy" of ionic compounds. For the alkalimetal halide salts, we have data for the Enthalpy of Formation (Delta H_f degree) of the salt, the Enthalpy of Vapourization of the metal (Delta H_vap), the enthalpy of dissociation of the halogen (Delta_diss), the Ionization Energy (IE) of the metal in the gas phase, and the Electron Affinity (EA) of the halogen atom. These data can be found in Atkins Appendix Tables 2.7, 13a, 10.3 and 10.4. Using these data from Atkins, calculate the Lattice Energy of (each student to he assigned a different salt!). In your calculation, be careful with the sign and with the coefficients. For instance, IE and EA are always defined as positive, but in your calculation using the cycle, think of the sign for EA! Similarly, realize that Delta_diss. is for the halogen X_2 (gas, liquid or solid!). Delta G of a given reaction can be represented by Delta_G_rxn = - 75.4 + 46.5T (J). Calculate Delta S_nxm.