Born-Haber Cycle: The Energy Behind NaCl Formation

The video tutorial explains the lattice energy of sodium chloride using the Born Haber cycle, which involves six steps. It starts with the reverse reaction of sodium chloride formation, followed by the sublimation of sodium, bond dissociation of chlorine, ionization of sodium, formation of chloride ions, and finally, the formation of sodium chloride crystal. The lattice energy is calculated using Hess's law, resulting in a value of -786 kJ/mol, indicating an exothermic process.

What is the enthalpy change when sodium chloride is formed from its elements?

• 411 kilojoules per mole

• 240 kilojoules per mole

• 496 kilojoules per mole

• 349 kilojoules per mole

What is the process called when solid sodium is converted into gaseous sodium?

• Ionization

• Sublimation

• Formation

• Dissociation

How much energy is required to dissociate one mole of chlorine molecules into atoms?

• 496 kilojoules per mole

• 108 kilojoules per mole

• 240 kilojoules per mole

• 120 kilojoules per mole

What is the energy change called when an electron is added to a chlorine atom?

• Electron affinity

• Sublimation energy

• Lattice energy

• Ionization energy

In the Born Haber cycle, what is the final step that forms solid sodium chloride?

• Ionization of sodium

• Sublimation of sodium

• Combination of gaseous ions

• Dissociation of chlorine

Which law is used to calculate the lattice energy of sodium chloride?

• Avogadro's Law

• Charles's Law

• Hess's Law

• Boyle's Law

What is the calculated lattice energy of sodium chloride?

• -496 kilojoules per mole

• -786 kilojoules per mole

• -349 kilojoules per mole

• -411 kilojoules per mole