The equation. C+2S → CS2 ∆H = +117.5 KJ/mole represents:
Correct answer: B. An endothermic reaction.
- A. An exothermic reaction.
- B. An endothermic reaction.
- C. An unbalanced equation.
- D. None of the above.
Explanation
The given reaction C+2S → CS2 with ∆H = +117.5 KJ/mole is endothermic, as indicated by the positive enthalpy change (∆H). This means that the reaction absorbs 117.5 KJ of energy per mole of CS2 formed. Option A is incorrect because exothermic reactions have a negative ∆H, meaning they release energy. Option C is incorrect because the equation is balanced. Option D is incorrect because one of the given options correctly describes the reaction.
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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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