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Which ONE of the following statements is CORRECT?

  • A.For an ideal gas, specific enthalpy (h) is a function of both temperature and pressure.
  • B.Internal energy (U), entropy (S), and enthalpy (H) are path functions.
  • C.Heat transferred (Q) and work done (W) are state (point) functions.
  • D.Temperature (T), pressure (P), and specific volume (v) are intensive properties.

Answer: D

The correct statement is Temperature (T), pressure (P), and specific volume (v) are intensive properties.

An intensive property does not depend on the amount of substance. Temperature and pressure clearly do not, and specific volume is volume per unit mass, which makes it intensive even though volume itself is extensive.

The other statements are false. For an ideal gas, enthalpy depends on temperature only. U, S and H are state (point) functions, not path functions. Heat and work are the path functions: their values depend on the process, not just on the end states.

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