#"NaCl"(s) -> "Na"(s) + 1/2"Cl"_2(g)#, #-DeltaH_(f,"NaCl"(s)) = +"411 kJ"# Use the Born-Haber cycle and data from Appendix IIB and Table 9.3 to calculate the lattice energy of CaO. Put this all together, with some data, and we get, for #"1 mol"# of #"NaCl"(s)#: Our goal is to transform the reactants into their ionic gases, as that is the reaction that describes the process for which "lattice energy" is defined.#"Na"(s) -> "Na"(g)#lArr# sublimation of sodium solid.#"Na"(g) -> "Na"^(+)(g) + e^(-)#lArr# Ionization of the gas to remove an electron is by definition the ionization energy.#1/2"Cl"_2(g) -> "Cl"(g)#lArr# chlorine is now made atomic (defines bond energy).#"Cl"(g) + e^(-) -> "Cl"^(-)(g)#lArr# chlorine was a gas, and now needs to gain an electron, the definition of electron affinity.#"Na"^(+)(g) + "Cl"^(-)(g) -> "NaCl"(s)#lArr# the formation of the lattice!
We begin by writing the formation reaction, which is by definition from the elemental states at #25^ Most of the time, the missing heat will be the lattice energy, but, occasionally, it will. When you press 'New Problem', a window will open with a set of thermochemical data related to an ionic compound.
#Born haber cycle problems lattice energy of cao how to#
See more: What Is A Perfect Psat Score ? Whats A Perfect Psat Score And How To Get It This page provides exercises in the use of the Born-Haber cycle to determine lattice energies of ionic compounds. The Born-Haber cycle takes advantage of the state function property of the change in enthalpy to indirectly determine the lattice energy of ionic compounds through processes that utilize known thermodynamic quantities like ionization energy and electron affinity. You are watching: Use the born-haber cycle and the data shown to calculate the lattice energy of cao.įor an alternative explanation, see here.
By definition, the gaseous cation and anion forming the corresponding ionic compound release energy termed the lattice energy, the energy contained within the lattice structure.
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