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State whether the following is true or false.
The fugacity of a component in an ideal gas mixture equals its partial pressure.

  • A.True only at large scales
  • B.False only at small scales
  • C.True
  • D.False

Answer: C

The fugacity coefficient is one throughout, so fugacity and partial pressure coincide. That identity is the reason fugacity is often described as a corrected pressure. Any departure from that equality measures non-ideality.

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