Which of the following units are not valid to describe the molar enthalpy of a mixture?
A. J/mol
B. nJ/kmol
C. m3•Pa/mol
D. Pa•s/mol
E. m3•bar/mol
A. Incorrect. This is the most common and accepted set of units for molar enthalpy.
B. Incorrect. A nanojoule is a very small amount of energy, but is a unit of energy.
C. Incorrect. If you look at a table of values for the gas constant (R) you will notice that the units in the numerator can be either energy or volume-pressure. So although odd-looking, these are dimensionally-valid units.
D. Correct. A pascal-second is a unit of viscosity and cannot be converted into a unit of energy.
E. Incorrect. This is a valid, if uncommon, set of units for molar enthalpy.
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