Calculate the Lattice Energy of Magnesium Sulfide from the Data

question 29

Multiple Choice

Calculate the lattice energy of magnesium sulfide from the data given below. Mg(s) → Mg(g) ΔH° = 148 kJ/mol
Mg(g) → Mg²⁺(g) + 2e⁻ ΔH° = 2186 kJ/mol
S₈(s) → 8S(g) ΔH° = 2232 kJ/mol
S(g) + 2e⁻ → S²⁻(g) ΔH° = 450 kJ/mol
8Mg(s) + S₈(s) → 8MgS(s) ΔH° = −2744 kJ/mol
Mg²⁺(g) + S²⁻(g) → MgS(s) ΔH°_lattice = ?

• A)−3406 kJ/mol
• B)−2720. kJ/mol
• C)2720. kJ/mol
• D)3406 kJ/mol
• E)None of these choices are correct.

---

Definitions:

Carrying Value

The book value of an asset on a company’s balance sheet, calculated as the original cost minus accumulated depreciation.

Bonds

Long-term debt securities issued by corporations or government entities that pay periodic interest until maturity, at which point the face value is repaid.

Bond Premium

The extra amount by which a bond's market price exceeds its face value.

Annual Interest Expense

The total amount of interest payments a company owes over the course of a year on any borrowed funds.