Chemical Engineering Thermodynamics

The equation DU = Tds – PdV is applicable to infinitesimal changes occuring in

  • A. An open system of constant composition
  • B. A closed system of constant composition
  • C. An open system with changes in composition
  • D. A closed system with changes in composition
Answer: Option D.

The given equation is a fundamental property relation and is valid for every open system with constant composition and for a closed system when no reaction is taking place in the system.

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