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4) Two moles of O2 gas at 1 atm and 10°C are mixed adiabatically with 4 moles of N2 gas at 1 atm and 80°C to yield a mixture whose pressure is also 1 atm.C, of O2 and N2 may be taken as 7 What is the entropy change for the process? mole-K

4) Two moles of O2 gas at 1 atm and 10°C are mixed adiabatically with 4 moles of N2 gas at 1 atm and 80°C to yield a mixture whose pressure is also 1 atm.C, of O2 and N2 may be taken as 7 What is the entropy change for the process? mole-K

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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4) Two moles of O2 gas at 1 atm and 10°C are mixed adiabatically with 4 moles of N2 gas at 1 atm and 80°C to yield a mixture whose pressure is also 1 atm.C, of O2 and N2 may be taken as 7 What is the entropy change for the process? mole-K
Transcribed Image Text:4) Two moles of O2 gas at 1 atm and 10°C are mixed adiabatically with 4 moles of N2 gas at 1 atm and 80°C to yield a mixture whose pressure is also 1 atm.C, of O2 and N2 may be taken as 7 What is the entropy change for the process? mole-K
Entropy Entropy of mixing for ideal gas Note: ASmix = AS1 + AS2 1- gas 1 2- gas 2 + Entropy (S) is defined as a measure of molecular randomness or molecular disorder. It is an intensive property and has a unit of energy per unit At constant Temperature: AS = nRln temperature. PO + n2Rln P2 ASmix = n1Rln cal S unit: = eu T K Note: Entropy change in ideal gas PO – initial pressure of gas 1 PO – initial pressure of gas 1 T2 nCyln: V2 + nRln V1 General Process: AS = T2 + nRln T1 P – final pressure of gas 1 P2 - final pressure of gas 2 P1 AS = nCpln; P2 V2 AS = nRln V1 Isothermal Process: T2 AS = nCyln T1 T2 nCpln Constant Volume: ASmix = n¡Rln + n2Rln- P1 P2 Constant Pressure: AS = тіх 4) Adiababtic Process: Q = 0 But: P, = N1Pt and P2 = N¿Pt AU = Q + W Q = 0 N, and N2 – mole fraction of the two gases PO + n²Rln N2Pt AU = W PO ASmix = n1Rln N Pt Сycle: AU = nCyAT Temperature constant Adiabatic Pressure Сycle constant AH = NC,AT Δυ 997.68 J -997.68 J ΔΗ 1662.8 J -1662.8 J Q -1662.8 J 1494.6594 J -168.1406J W 997.68 J 665.12 J -1494.6594J 168.1406J
Transcribed Image Text:Entropy Entropy of mixing for ideal gas Note: ASmix = AS1 + AS2 1- gas 1 2- gas 2 + Entropy (S) is defined as a measure of molecular randomness or molecular disorder. It is an intensive property and has a unit of energy per unit At constant Temperature: AS = nRln temperature. PO + n2Rln P2 ASmix = n1Rln cal S unit: = eu T K Note: Entropy change in ideal gas PO – initial pressure of gas 1 PO – initial pressure of gas 1 T2 nCyln: V2 + nRln V1 General Process: AS = T2 + nRln T1 P – final pressure of gas 1 P2 - final pressure of gas 2 P1 AS = nCpln; P2 V2 AS = nRln V1 Isothermal Process: T2 AS = nCyln T1 T2 nCpln Constant Volume: ASmix = n¡Rln + n2Rln- P1 P2 Constant Pressure: AS = тіх 4) Adiababtic Process: Q = 0 But: P, = N1Pt and P2 = N¿Pt AU = Q + W Q = 0 N, and N2 – mole fraction of the two gases PO + n²Rln N2Pt AU = W PO ASmix = n1Rln N Pt Сycle: AU = nCyAT Temperature constant Adiabatic Pressure Сycle constant AH = NC,AT Δυ 997.68 J -997.68 J ΔΗ 1662.8 J -1662.8 J Q -1662.8 J 1494.6594 J -168.1406J W 997.68 J 665.12 J -1494.6594J 168.1406J
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