Which one of the following has standard enthalpy of formation is zero?
Correct answer: C. Cu(s)
- A. Fe(g)
- B. C(l)
- C. Cu(s)
- D. Na(g)
Explanation
Standard enthalpy of an element in its standard state is zero. Copper is a solid in standard form.
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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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