Enthalpy of combustion of a substance is
Correct answer: B. Spontaneous and exothermic
- A. Spontaneous and endothermic
- B. Spontaneous and exothermic
- C. Non-spontaneous and endothermic
- D. Non-spontaneous and exothermic
Explanation
The enthalpy of combustion of a substance refers to the heat released or absorbed when one mole of the substance undergoes complete combustion with oxygen under standard conditions. Typically, combustion reactions release heat, making them exothermic processes. Additionally, these reactions tend to occur spontaneously under standard conditions.
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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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