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For a one-component system existing as a single phase, the number of degrees of freedom is

  • A.zero
  • B.three
  • C.two
  • D.one

Answer: C

Correct answer: two

\[ F = 1 - 1 + 2 = 2. \] Both temperature and pressure may be varied independently within a single-phase region, which is why such regions appear as areas on a pressure-temperature diagram rather than as lines or points.

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