Worksheet: The Phase Rule

In this worksheet, we will practice using the phase rule to determine the degrees of freedom in a system from the numbers of components and phases.


Which of the following statements is incorrect?

  • AWhen three phases coexist in equilibrium in a one-component system, one of the phases must be a gas, one must be a liquid, and one must be a solid.
  • BFor a one-component system, the most stable phase at given 𝑇 and 𝑃 is the phase with the lowest molar Gibbs free energy, 𝐺.
  • CFor a pure substance, the vapor pressure of the solid is equal to the vapor pressure of the liquid at the triple-point temperature.
  • DFor a one-component system, the maximum number of phases that can coexist in equilibrium is three.

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