The equation that represents standard enthalpy of atomization of hydrogen is:
Correct answer: C. Option C
- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation
Standard enthalpy of atomization is the enthalpy change that occurs when one mole of a sample is dissociated into its atoms under standard conditions. All bonds in the compound are broken in atomization and none are formed, so enthalpies of atomization are always positive (endothermic). For example, the standard enthalpy of atomization of hydrogen is given below.
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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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