Standard enthalpy for 1 mole of a substance, which exists in its natural state, at I atm. Pressure is measured in ?
Correct answer: B. 298 K
- A. 0 K
- B. 298 K
- C. 273 K
- D. 0 °C
Explanation
Standard enthalpy (ΔH ) for 1 mole of a substance in its natural state at 1 atm pressure is typically measured at 298 K (25°C).
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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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