Critical temperature crowding

Problem 2.27 Use the SRK equation to perform the following calculations for isobutane to make a graph that shows three isotherms, one at 30 °C, one at the critical temperature, and one at 150 C. Make the axis logarithmic in volume and linear in pressure, and select the range in the two axes so that the graph is not crowded and its important features are seen clearly. Report volume in ms/mol, pressure in bar and temperature in °C. Annotate the graph and label the axes properly. 

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