How to Find the Lattice Energy of a Compound

Find the energy difference between compounds to understand alpha and beta levels.
••• Jupiterimages/liquidlibrary/Getty Images

Lattice energy is the a measure of how strong an ionic bond is. An ionic bond is the joining together of two electrically charged atoms called ions in order to form a compound. A common example of a compound formed from an ionic bond is table salt, sodium chlorine NaCl. The Born-Lande equation is used to find the lattice energy of a compound, and the formula for the equation is E = [-(NA)(M)(Z+)(Z-)/4(pi)(e0)(r0)][1-(1/n)]. While this may look exceedingly complicated, most of the equation is constants, meaning the values are the same every time.

    Plug in the constants. The constants in the equation are NA which is the symbol for Avogadro's constant 6.02214179(30)×10^23 mol; e, the elementary charge 1.602176487(40)×10^-19 c), and e0, the permittivity of free space, 8.854×10^−12 c^2 J^−1 mol^−1.

    Fill in the variables that change depending on the compound. The information that needs to be given is the Madelung constant represented as M, which, despite being called a "constant," as it is indeed constant within the compound itself, is different for each compound; the charge of the positive ion also called a cation, represented as Z+; the charge of the negative ion also called an anion, and shown as Z-; the distance to the nearest ion, shown as r0, and the Born exponent, represented as n, which is a number between 5 and 12.

    Solve the equation. The final value of lattice energy should be in kilojoules per mole.


    • Be sure not to lose the negative at the beginning of the equation. The final number for the lattice energy of a compound should always be negative.

Related Articles

Bromine vs. Chlorine Bond Energy
How to Convert Joules to Grams
Why Is Copper Sulfate Blue?
How to Convert BTU to Horsepower
How to Solve a Parabola
How to Calculate Bond Order
How to Calculate a Fraction Covalent
How to Calculate the Ionization Energy of Atoms
How to Calculate Entropy Change
How to Determine Moles in Chemistry
How to Simplify Exponents
How to Do Exponents Outside of the Parenthesis
What Are Subscripts in a Chemical Formula Used to...
How to Convert Lux to Candela
How to Convert BTU Per Hour to CFM of Natural Gas
How to Convert Reserve Capacity to Amp Hours
How to Calculate Molar Solubility From KSP?
How to Calculate Force of Attraction Between Ions
Activation Energy of the Iodine Clock Reaction
Sulfuric Acid & Chlorine Bleach Reaction

Dont Go!

We Have More Great Sciencing Articles!