For a reaction that can takes place in more than one ways, the enthalpy of that reaction is _?
Correct answer: A. Same for all the routes of that reaction
- A. Same for all the routes of that reaction
- B. Different for different routes of that reaction
- C. Depends up on the reactants present in each route
- D. None of these
Explanation
Option A is correct since it states the correct definition of Hess's law which is: If a chemical change takes place by several different routes, the overall energy change is the same, regardless of the route by which the chemical change occurs, provided the initial and final conditions are the same.
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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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