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A light hydrocarbon gas mixture is stored in a tank at 25C and 9.5 MPa. The gas mixture contains 90mol % methane, 7.5mol % ethane, and the remaining CO2. The critical properties of these components are shown in the table below. Component Molar Mass (kg/kmol) Methane Ethane CO2 16.04 30.07 44.01 Tc (K) 190.6 305.4 304.2 Pc (atm) 45.4 48.2 72.8 W 0.008 0.098 0.225 Calculate the following: a) Density of gas using ideal gas law b) Density of gas using Pitzer-Curl Method (you can select the closest value that is listed in the table, you do not need to interpolate). c) Which volume value calculated above is more accurate and why?

A light hydrocarbon gas mixture is stored in a tank at 25C and 9.5 MPa. The gas mixture contains 90mol % methane, 7.5mol % ethane, and the remaining CO2. The critical properties of these components are shown in the table below. Component Molar Mass (kg/kmol) Methane Ethane CO2 16.04 30.07 44.01 Tc (K) 190.6 305.4 304.2 Pc (atm) 45.4 48.2 72.8 W 0.008 0.098 0.225 Calculate the following: a) Density of gas using ideal gas law b) Density of gas using Pitzer-Curl Method (you can select the closest value that is listed in the table, you do not need to interpolate). c) Which volume value calculated above is more accurate and why?

Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
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A light hydrocarbon gas mixture is stored in a tank at 25C and 9.5 MPa. The gas mixture contains 90mol% methane, 7.5mol% ethane, and the remaining CO2. The critical properties of these components are shown in the table below. Component Molar Mass (kg/kmol) Tc (K) Pc (atm) Methane 16.04 190.6 45.4 0.008 Ethane 30.07 305.4 48.2 0.098 CO2 44.01 304.2 72.8 0.225 Calculate the following: a) Density of gas using ideal gas law b) Density of gas using Pitzer-Curl Method (you can select the closest value that is listed in the table, you do not need to interpolate). c) Which volume value calculated above is more accurate and why?
Transcribed Image Text:A light hydrocarbon gas mixture is stored in a tank at 25C and 9.5 MPa. The gas mixture contains 90mol% methane, 7.5mol% ethane, and the remaining CO2. The critical properties of these components are shown in the table below. Component Molar Mass (kg/kmol) Tc (K) Pc (atm) Methane 16.04 190.6 45.4 0.008 Ethane 30.07 305.4 48.2 0.098 CO2 44.01 304.2 72.8 0.225 Calculate the following: a) Density of gas using ideal gas law b) Density of gas using Pitzer-Curl Method (you can select the closest value that is listed in the table, you do not need to interpolate). c) Which volume value calculated above is more accurate and why?
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