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 Volume change of lattice?
Volume change of lattice calculator uses Molar Volume Lattice Energy = (Lattice Enthalpy-Lattice Energy)/Pressure Lattice Energy to calculate the Molar Volume Lattice Energy, The Volume change of lattice formula is the molar volume occupied by a crystal lattice with maximum stabilization factors. Molar Volume Lattice Energy is denoted by Vm_LE symbol.
How to calculate Volume change of lattice using this online calculator? To use this online calculator for Volume change of lattice, enter Lattice Enthalpy (ΔH), Lattice Energy (U) & Pressure Lattice Energy (pLE) and hit the calculate button. Here is how the Volume change of lattice calculation can be explained with given input values -> 22.4 = (21420-3500)/800.