Which equation shows lattice energy for ionic compound?
Correct answer: D. Na˕(g) + Cl-(g) → NaCl(s)
- A. Na(s) + 1/2 Cl2(g) → NaCl(s)
- B. Na˕(aq) + Cl-(aq) → NaCl(aq)
- C. Na(s) + Cl(g) → NaCl(s)
- D. Na˕(g) + Cl-(g) → NaCl(s)
Explanation
Option D is correct.The equation that shows lattice energy for an ionic compound is: Na ˕ (g) + Cl ⁻ (g) → NaCl(s) This equation shows the formation of the solid ionic compound NaCl from the gaseous ions Na ˕ and Cl ⁻. The lattice energy is the energy required to convert the gaseous ions into the solid ionic compound.
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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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