The Poynting equation (Poynting correction) should NOT be used…
A. …in industry as it is too empirical.
B. …for solids.
C. …when the ideal gas law does not apply.
D. …without reliable data, such as a saturation curve, that appropriately describes the vapor pressure of the substance.
E. …at all as it has been superseded by more accurate equations.
A. Incorrect. Poynting is not “empirical”; it has a specific theoretical basis. Additionally, there is nothing wrong with using empirical relationships and equations in an industrial setting, as long as their limitations are recognized.
B. Incorrect. Poynting’s correction factor is commonly used to determine fugacities of solids or liquids.
C. Incorrect. Poynting’s equation is in no way dependent on the ideal gas law or its assumptions.
D. Correct. Poynting “corrects” the known fugacity at one set of conditions to the actual conditions. But this requires one known fugacity which is conventionally obtained from vapor pressure data.
E. Incorrect. Poynting’s equation is still widely used.
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