The enthalpy change of the reaction H2(g) + ½ O2 -> H2O (l) under standard conditions is:
Correct answer: C. Both; Enthalpy change of combustion of Hydrogen and enthalpy change of formation of water
- A. Enthalpy change of formation of water
- B. Enthalpy change of neutralization
- C. Both; Enthalpy change of combustion of Hydrogen and enthalpy change of formation of water
- D. Enthalpy change of combustion of Hydrogen
Explanation
Since 1 mole of H2 is being combusted, it can be called enthalpy change of combustion of H2. Also, 1 mole of water is being formed from its constituent elements under standard state so it can also be called standard enthalpy change of formation of water.
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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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