Consider the comparison made between accurate results and those based on calculations using the van der Waals
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Figure 7.1
Figure 7.5
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140 120 100 80 40 20 0.25 0.75 0.50 1.00 1.25 1.50 1.75 Molar volume/L (a) 500 400 300 200 100 0.2 0.3 0.4 0.5 0.6 Molar volume/L (b) Pressure/bar Pressure/bar 1.2 R-K 400. K 1.1 vdW 400. K N 1.0 100 150 200 •250 300 Pressure/bar 0.9 R-K 200. K vdW 200. K- 0.8
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