1/2 H2(g) ➞ H(g) ∆H = 218 kJ mol-1.In this reaction, ∆H will be called:
Correct answer: A. Enthalpy of atomization
- A. Enthalpy of atomization
- B. Enthalpy of decomposition
- C. Enthalpy formation
- D. Enthalpy of the dissociation
Explanation
Enthalpy change of atomisation is when one mole of a gaseous atom is formed from its element in its standard state, under standard conditions. According to the equation above one mole of hydrogen atom is formed from its diatomic form in its gaseous state.
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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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