Pick out the correct statement?
Correct answer: E. The heat of formation of a compound is defined as the heat of reaction leading to the
- A. If an insoluble gas is passed through a volatile liquid placed in a perfectly insulated container,
- B. the temperature of the liquid will increase
- C. A process is irreversible as long as Δ S for the system is greater than zero
- D. The mechanical work done by a system is always equal to∫P.dV
- E. The heat of formation of a compound is defined as the heat of reaction leading to the
- F. formation of the compound from its reactants
Explanation
The intended final statement defines heat of formation as the heat effect for forming a compound from its constituent reactants, normally the elements in their standard states. The other statements are false: evaporation generally cools the liquid, system entropy increase alone is not a universal irreversibility test, and ∫P dV represents only boundary work.
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