Use the Born-Haber Cycle to Calculate the Lattice Energy of KCl(s)

question 38

Multiple Choice

Use the Born-Haber cycle to calculate the lattice energy of KCl(s) given the following data: $\Delta$ H(sublimation) K = 79.2 kJ/mol
I₁ (K) = 418.7 kJ/mol
Bond energy (Cl-Cl) = 242.8 kJ/mol
EA (Cl) = 348 kJ/mol
$\Delta{H}^{\circ}_f$ (KCl(s) ) = -435.7 kJ/mol

• A) -165 kJ/mol
• B) 288 kJ/mol
• C) 629 kJ/mol
• D) 707 kJ/mol
• E) 828 kJ/mol

---

Definitions:

Certification Election

A formal process in which employees vote to decide whether they wish to be represented by a union.

Picketing

Occurs when workers representing the union march at the entrance to the employer’s facility with signs explaining their reasons for striking.

Price Floor

A government- or authority-imposed price control or limit on how low a price can be charged for a product.

Effective Price Floor

A government-imposed price control above the equilibrium price, intended to ensure producers receive a minimum price higher than what the market would naturally dictate.