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For a two-component condensed system the reduced phase rule is written

  • A.\( F = C - P \)
  • B.\( F = C + P - 1 \)
  • C.\( F = C - P + 1 \)
  • D.\( F = C - P + 2 \)

Answer: C

Correct answer: \( F = C - P + 1 \)

Holding the pressure constant removes one variable, so the two in the full rule becomes one. The result is written \( F' \) and called the condensed or reduced phase rule, and it is what makes a binary solid-liquid diagram intelligible as a plot of temperature against composition alone.

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