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Assuming that the constant pressure heat capacities are independent of temperature, use the data below to calculate the equilibrium constant for the reaction at 225, 300 and 450 oC, at standard pressure. Comment on your results. (i) Standard enthalpy change for the reaction(∆H°R)= (-91)kJ/mol (ii) Standard entropy change for the reaction(∆S°R)= (-219.3 )J/(mol K) (iii) Standard Gibbs energy change for the reaction(∆G°)= (-25.649) kJ/mol (iv) Equilibrium constant (k)=1.0104 at 298K  (v) The change in the heat capacity at constant pressure for the chemical reactions, under standard conditions. = 42.8 J/k mol

Assuming that the constant pressure heat capacities are independent of temperature, use the data below to calculate the equilibrium constant for the reaction at 225, 300 and 450 oC, at standard pressure. Comment on your results. (i) Standard enthalpy change for the reaction(∆H°R)= (-91)kJ/mol (ii) Standard entropy change for the reaction(∆S°R)= (-219.3 )J/(mol K) (iii) Standard Gibbs energy change for the reaction(∆G°)= (-25.649) kJ/mol (iv) Equilibrium constant (k)=1.0104 at 298K  (v) The change in the heat capacity at constant pressure for the chemical reactions, under standard conditions. = 42.8 J/k mol

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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Assuming that the constant pressure heat capacities are independent of temperature, use the data below to calculate the equilibrium constant for the reaction at 225, 300 and 450 oC, at standard pressure. Comment on your results.

  1. (i) Standard enthalpy change for the reaction(∆H°R)= (-91)kJ/mol
  2. (ii) Standard entropy change for the reaction(∆S°R)= (-219.3 )J/(mol K)
  3. (iii) Standard Gibbs energy change for the reaction(∆G°)= (-25.649) kJ/mol
  4. (iv) Equilibrium constant (k)=1.0104 at 298K 
  5. (v) The change in the heat capacity at constant pressure for the chemical reactions, under standard conditions. = 42.8 J/k mol
Chemical thermodynamics in the manufacture of methanol Methanol (CH3OH) is used to manufacture a large number of important chemicals, such as formaldehyde (HCHO) which is employed in the manufacture of a variety of polymers; ((CH3),OCH3), which has been used as a lead-free anti-knocking agent in petrol; acetic acid (CH;CO2H), etc. Annual production of methanol has been increasing: from 3.3 MTe/yr in 1982,' to 20 MTe/yr in 1991.2 methyl-tertiary-butylether Methanol is manufactured using synthesis gas (a mixture of carbon monoxide, co, and hydrogen, H2) through the following chemical equilibrium. co(x)+2H,(x)=CH,OH(8) Thermodynamic data (standard enthalpies of formation, AH, absolute entropies, s°, and heat capacities (Cp) at 298 K) corresponding to the five chemical species in the above chemical reactions are given in Table 1 below. Table 1: Thermodynamic quantities for the reacting gases involved in the manufacture of methanol. CplJ K mol" Species Co(g) H2(g) CH;OH(g) AH /kJ mol S'IJ mol K' -110.5 197.7 29.1 0.0 130.7 28.8 -201.5 239.8 43.9
Transcribed Image Text:Chemical thermodynamics in the manufacture of methanol Methanol (CH3OH) is used to manufacture a large number of important chemicals, such as formaldehyde (HCHO) which is employed in the manufacture of a variety of polymers; ((CH3),OCH3), which has been used as a lead-free anti-knocking agent in petrol; acetic acid (CH;CO2H), etc. Annual production of methanol has been increasing: from 3.3 MTe/yr in 1982,' to 20 MTe/yr in 1991.2 methyl-tertiary-butylether Methanol is manufactured using synthesis gas (a mixture of carbon monoxide, co, and hydrogen, H2) through the following chemical equilibrium. co(x)+2H,(x)=CH,OH(8) Thermodynamic data (standard enthalpies of formation, AH, absolute entropies, s°, and heat capacities (Cp) at 298 K) corresponding to the five chemical species in the above chemical reactions are given in Table 1 below. Table 1: Thermodynamic quantities for the reacting gases involved in the manufacture of methanol. CplJ K mol" Species Co(g) H2(g) CH;OH(g) AH /kJ mol S'IJ mol K' -110.5 197.7 29.1 0.0 130.7 28.8 -201.5 239.8 43.9
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