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Three hundred L/h of a 20 mole% C3H3-80% n-C4H₁o gas mixture at 0°C and 1.1 atm and 200 L/h of a 40 mole% C³Hs-60% n-C¿H₁0 mixture at 25°C and 1.1 atm are mixed and heated to 227°C at constant pressure. Enthalpies of propane and n-butane are listed below. Assume ideal-gas behavior.

Three hundred L/h of a 20 mole% C3H3-80% n-C4H₁o gas mixture at 0°C and 1.1 atm and 200 L/h of a 40 mole% C³Hs-60% n-C¿H₁0 mixture at 25°C and 1.1 atm are mixed and heated to 227°C at constant pressure. Enthalpies of propane and n-butane are listed below. Assume ideal-gas behavior.

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
Problem 1.1P
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**Problem:** Three hundred L/h of a 20 mole% \( C_3H_8 \), 80% \( n-C_4H_{10} \) gas mixture at \( 0^\circ C \) and 1.1 atm and 200 L/h of a 40 mole% \( C_3H_8 \), 60% \( n-C_4H_{10} \) mixture at \( 25^\circ C \) and 1.1 atm are mixed and heated to \( 227^\circ C \) at constant pressure. Enthalpies of propane and \( n \)-butane are listed below. Assume ideal-gas behavior. | T (°C) | Propane Ĥ (J/mol) | Butane Ĥ (J/mol) | |--------|-------------------|------------------| | 0 | 0 | 0 | | 25 | 1722 | 2394 | | 227 | 20,685 | 27,442 | **Questions:** a) Calculate the heat requirement in kJ/h. *(Hint: See Example 7.6-2)* b) Where in your calculations did you use the ideal-gas assumption?
Transcribed Image Text:**Problem:** Three hundred L/h of a 20 mole% \( C_3H_8 \), 80% \( n-C_4H_{10} \) gas mixture at \( 0^\circ C \) and 1.1 atm and 200 L/h of a 40 mole% \( C_3H_8 \), 60% \( n-C_4H_{10} \) mixture at \( 25^\circ C \) and 1.1 atm are mixed and heated to \( 227^\circ C \) at constant pressure. Enthalpies of propane and \( n \)-butane are listed below. Assume ideal-gas behavior. | T (°C) | Propane Ĥ (J/mol) | Butane Ĥ (J/mol) | |--------|-------------------|------------------| | 0 | 0 | 0 | | 25 | 1722 | 2394 | | 227 | 20,685 | 27,442 | **Questions:** a) Calculate the heat requirement in kJ/h. *(Hint: See Example 7.6-2)* b) Where in your calculations did you use the ideal-gas assumption?
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