According to Born Haber's cycle, ∆Hlatt of ionic compound is determined by the formula:
Correct answer: A. ∆Hlatt = ∆Hf - ∆Hx
- A. ∆Hlatt = ∆Hf - ∆Hx
- B. ∆Hlatt = ∆Hx - ∆Hf
- C. ∆Hlatt = ∆Hx + ∆Hf
- D. ∆Hlatt = ∆Ha - ∆Hx
Explanation
The lattice energy, gives us some idea of the force of attraction between Na+ and Cl- ions in crystalline sodium chloride. Lattice energies are very helpful in discussing the structure, bonding and properties of ionic compounds. The lattice energy for sodium chloride can thus be obtained: ∆Hlatt = ∆Hf - ∆Hx.
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Thermochemistry measures energy changes in chemical reactions and distinguishes exothermic from endothermic processes. Work covers systems, surroundings and state functions, internal energy, the first law of thermodynamics, enthalpy and Hess's law, including the sign conventions used when heat enters or leaves a system.
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