Chemical Engineering Thermodynamics

Pick out the wrong statement.

  • A. Surface tension of a substance vanishes at critical point, as there is no distinction between liquid and vapour phases at its critical point
  • B. Entropy of a system decreases with the evolution of heat
  • C. Change of internal energy is negative for exothermic reactions
  • D. The accentric factor for all materials is always more than one
Answer: Option D.

The acentric factor can’t always be greater than 1. For many monoatomic fluids the acentric factor is close to zero.

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