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A phase in the phase rule is a portion of a system that is

  • A.capable of existing only at one temperature
  • B.physically distinct and mechanically separable
  • C.chemically distinct in its composition
  • D.present in the largest proportion by mass

Answer: B

A mixture of gases is one phase however many species it contains, because it is homogeneous throughout with no internal boundary. Two immiscible liquids, or several different solids present together, count as one phase each.

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