This problem examines the generalization mentioned in Section 7-3, that the Lee-Kesler generalized approach should not be applied to highly polar compounds.

A. Choose three temperatures and three pressures that, for water, fall within the range 0.7 r r

B. For each of the nine data points identified in part A, estimate the molar volume of water from the Lee-Kesler approach, and compare to the data in the steam tables.

C. Repeat parts A and B for methane. Use the same reduced temperatures and pressures that you identified in part A for water, and compare the results of the Lee-Kesler approach to the data in Figure 7-1.

D. Comment of the results, recognizing that water is highly polar and methane is non-polar.

E. Choose your own compound that is more polar than methane, but less polar than water, and repeat parts A and B for this compound.

Transcribed Image Text:

FIGURE 7-1 Thermodynamic properties of methane. Pressure, psia 200 10,000 7000 5000 3000 2000 1000 275 32 www. 100 150 400 600 PEPTES the MIR HE CHIME H TAREHE THE LASE 200 250 300 800 350 Enthalpy, kJ/kg 1000 535 400 450 Enthalpy, Btu/lb m 1200 DAH! WIE 500 550 1400 600 650 1600 28 88 26632 0.1 0.07 0.05 0.03 0.02 GH CHRON 700 740 0.01 Pressure, MPa