∆H for the transition of carbon in the diamond form to carbon in the graphite form is 1.9kJ. This suggests that:
Correct answer: C. Graphite is more stable than diamond
- A. Graphite is chemically different from diamond
- B. Graphite is as stable as diamond
- C. Graphite is more stable than diamond
- D. Diamond is more stable than graphite
Explanation
The negative value of ∆H (-1.9 kJ) for the transition of carbon from diamond to graphite indicates that the process is exothermic and that graphite is the more stable form of carbon compared to diamond.
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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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