Which of the following is a true statement about the Peng-Robinson parameters a andb?
A. The b variable is ultimately a function of universal physical constants and so has the same value for all compounds.
B. The a variable can have units of L•J/kmol•mol
C. The a variable is calculated by 27/64 (R^2 T_c^2)/P^2
D. The b variable has dimensions of amount of substance per length to the third power.
E. None of these statements are true.
A. Incorrect. The b is a function of the critical temperature and pressure of the compound.
B. Correct. Although unconventional, these are valid units. You are probably more familiar with, and will see more often, units like Pa•m6/mol2
C. Incorrect. This is the formula for a in the van der Waals EOS.
D. Incorrect. This is the inverse of molar volume, which is what b is expressed in.
E. Incorrect. One of the four statements is true.
You might also like to view...
6. For signal sequence in the accompanying image =_________(x.xx)
Fill in the blank(s) with the appropriate word(s).
1/2 + 3/8 - 1/4 = ____.
A. 2/16 B. 1/2 C. 4/5 D. 5/8
Support angles for bridge decks should not be welded to the flanges of beams that _____.
a. have a web less than 8" deep b. are in tension c. rest on a bridge center pier d. are in compression
Round 992.354 6 to the nearest hundredth
What will be an ideal response?