Why are lattice energy and enthalpy defined using opposite signs?
The lattice energy and enthalpy defined using opposite signs as the energy required to convert the crystal into infinitely separated gaseous ions in vacuum, an endothermic process. Following this convention, the lattice energy of NaCl would be +786 kJ/mol. The lattice energy for ionic crystals such as sodium chloride, metals such as iron, or covalently linked materials such as diamond is considerably greater in magnitude than for solids such as sugar or iodine, whose neutral molecules interact only by weaker dipole-dipole or van der Waals forces.
How to Calculate Lattice Enthalpy using Lattice Energy?
Lattice Enthalpy using Lattice Energy calculator uses Lattice Enthalpy = Lattice Energy+(Pressure Lattice Energy*Molar Volume Lattice Energy) to calculate the Lattice Enthalpy, The Lattice Enthalpy using Lattice Energy corresponds to the coalescing of infinitely separated gaseous ions in vacuum to form the ionic lattice. Lattice Enthalpy is denoted by ΔH symbol.
How to calculate Lattice Enthalpy using Lattice Energy using this online calculator? To use this online calculator for Lattice Enthalpy using Lattice Energy, enter Lattice Energy (U), Pressure Lattice Energy (pLE) & Molar Volume Lattice Energy (Vm_LE) and hit the calculate button. Here is how the Lattice Enthalpy using Lattice Energy calculation can be explained with given input values -> 21420 = 3500+(800*22.4).