Use Figure 7-13 to estimate the compressibility (Z) of supercritical toluene at T = 651 K and P = 57.5 bar.

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PV RT Z= N 1.1 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 Bo box 80 0 0.5 Noocki + O 0 +0 + 00+ = 1.00 T₁ T₁ = 1.10 O 6 1.0 1.5 2.0 0+0 PAO T₁ = 1.20 0 ठ 0 0 40 40 40 + DOD +0 T₁=2 = 2.00 + + + T, = 1.30 004 + T₁: = 1.50 O A O + go P60 + 0 + 4 for 04 04 00 +0° ,0 O - + Methane o Ethylene A Ethane o Propane □n-Butane 3 Legend DO I 1 1 2.5 3.0 3.5 4.0 4.5 5.0 i-Pentane e n-Heptane Nitrogen . Carbon dioxide • Water Average curve based on data for hydrocarbons 0 1 5.5 0 6.0 Reduced pressure, P, FIGURE 7-13 The Z-P, plot, showing discrete data points for various compounds and average trendlines for hydrocarbons. 7.0