Repeat the calculation of the previous problem using Aspen Plus and the Peng-Robinson equation with its default

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Repeat the calculation of the previous problem using Aspen Plus and the Peng-Robinson equation with its default parameters.

previous problem

A natural gas stream 90 mol % CH4 (component 1) contaminated with 10 mol % CO2 (component 2). In order to calculate pumping requirements you are asked to perform calculations of properties of the gas mixture at 300 K and 10 bar.

To a reasonable first approximation this gas mixture can be represented by the van der Waals equation of state with the van der Waals mixing rules. Purecomponent constants for the van der Waals equation of state are a=0.2303Pa m6/mol2, b=4.306 × 10−5m3/mol for CH4 and a=0.3658Pa m6/mol2, b=4.286 × 10−5m3/mol for CO2. [The binary interaction parameter kij may be taken to be 0.]

a. Calculate the molar volume of the mixture at 300 K and 10 bar. 

b. Calculate the difference between the real and ideal gas molar enthalpies of this mixture at 300 K and 15 bar. 

c. Caclulate the difference between the real and ideal gas molar entropies of this mixture at 300 K and 15 bar.  

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