Chemical Engineering Thermodynamics (MCQs)

A closed system is cooled reversibly from 100°C to 50°C. If no work is done on the system

  • A. Its internal energy (U) decreases and its entropy (S) increases
  • B. U and S both decreases
  • C. U decreases but S is constant
  • D. U is constant but S decreases
Answer: Option B.

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