∆H,-572kJ/mol-1 for water It means that:
Correct answer: A. It is an exothermic process
- A. It is an exothermic process
- B. Formation of water is a spontaneous process
- C. It is the heat evolved for complete reaction of 2 moles of oxygen with excess of hydrogen
- D. Water is at lower energy than its reactants
Explanation
The enthalpy change (∆H) is negative, which means that heat is absorbed from the surroundings during the formation of water. This is an endothermic process.
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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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