The enthalpy change for the process C(s) ➝ C(g)corresponds to enthalpy of
Correct answer: C. Sublimation
- A. Fusion
- B. Vaporization
- C. Sublimation
Explanation
Sublimation is a phase transition in which a substance changes directly from a solid to a gas without passing through the liquid phase. This process occurs when the substance absorbs heat energy, typically from its surroundings, causing the solid's particles to gain enough energy to transition directly into a gaseous state. The reverse process, where a gas changes directly into a solid, is known as deposition.
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About Thermochemistry and Energetics of Chemical Reactions
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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