For a compound with an acentric factor of 0.157, critical pressure of 157,000 Pa and critical temperature of 261.7 K, what does Lee-Kesler predict the compressibility factor to be at STP (273.15 K, 0.1 MPa)?
A. 0.0599
B. 0.592
C. 0.692
D. 0.746
E. None of these values
A. Incorrect. You have mixed up Equation 7.80.
B. Incorrect. You read Figure 7-14 incorrectly.
C. Correct. You may have a slightly different value from reading the two charts slightly differently. Note that this hypothetical compound has an aberrantly low critical pressure; almost all compounds in the gas phase would have Z~1 at STP.
D. Incorrect. You have probably misread the two graphs of Z0 and Z1. The abscissa is logarithmic, not linear.
E. Incorrect. One of these is the predicted value. If your answer is only slightly different than one of them, it is likely correct and we have just read the graphs differently.
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