Born-Haber Cycles

• Allows the calculation of an enthalpy change that cannot be measured directly.

WHY CANT IT BE MEASURED?

• Can't be done in standard conditions
• A lattice can't be made from gaseous ions

BEGIN:

• Start your elements at their standard states on the zero line.
• Enthalpy of formation is exothermic, so draw a line pointing down to make your ionic compound.
• From the zero line, draw the next series of arrows.

ATOMISATION:

• Enthalpy of atomisation is an endothermic process, so arrows will point UP.
• Atomisation always makes 1 mol, so if you are making…