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what role does lattice energy play in forming an ionic compound?
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An estimate of the strength of the bonds in an ionic compound can be obtained by measuring the lattice energy of the compound, which is the energy given off when oppositely charged ions in the gas phase come together to form a solid.
The bonds in compound A are stronger than the bonds in compound B.
The crystal lattice that is formed has a lower potential energy than the reactants. This is because energy is expended to create the ionic compound.
Lattice Energy
The lattice energy of an ionic solid is a measure of the strength of bonds in that ionic compound. It is usually defined as the enthalpy of formation of the ionic compound from gaseous ions and as such is invariably exothermic. The concept of lattice energy has initially been developed for rocksalt-structured and sphalerite-structured compounds like NaCl and ZnS, where the ions occupy high-symmetry crystal lattice sites. In case of NaCl, the lattice energy is the energy released by the reaction
Ions release some amount of energy when they get together to form a lattice. If it is needed to be seperated into ions again, the same energy should be absorbed. The energy to break 1 mole of a lattice at the standard temperature and pressure is defined as the standard lattice energy. Using formulae, the lattice energy at any conditions can be found as the standard values are tabulated.
Lattice energy
Definitions of lattice energy: * The energy released when one mole of a crystal is formed from gaseous ions.misterguch.brinkster.net/vocabulary.html * The energy for the reaction of the infinitely separated ions to give the solid. It measures the electrostatic interaction between the ions.www.everyscience.com/Chemistry/Glossary/L.php * The energy given off when oppositely charged ions in the gas phase come together to form a solid. For example, the energy given off in the following reaction: Na + (g) + Cl - (g) NaCl(s).xenon.che.ilstu.edu/genchemhelphomepage/glossary/l.html * Lattice energy deals primarily with metals. The lattice energy, or lattice enthalpy, of an ionic solid is a measure of the strength of bonds in that ionic compound. It is given the symbol U and is equivalent to the amount of energy required to separate a solid ionic compound into gaseous ions. ...en.wikipedia.org/wiki/Lattice energy the lattice energy of an ionic solid is a measure of the strength of bods in that ionic compound. it is usually defined as the enthalpy of formation of ionic compound from the gaseous ions and as such is invariably exothermic
Bond enthalpy is the energy required to break a chemical bond whereas lattice energy is the enthalpy of formation of one mole of an ionic compound from gaseus ions under standard conditions.
The lattice energy of potassium bromide is more exothermic than the lattice energy of rubidium iodide because lattice energy is inversely proportional to atomic radius.