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All of the following are true of the Maxwell equal area construction EXCEPT

  • A.it locates the saturation pressure on an isotherm
  • B.it makes the two loop areas equal
  • C.it replaces the unstable loop with a horizontal line
  • D.it removes the need for an equation of state entirely

Answer: D

The construction operates on the loop an equation of state produces, so it presupposes one rather than replacing it. The other three describe exactly what it does. It is the standard way of extracting a saturation pressure.

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