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The full form of the temperature dependence of Ka is implemented in Kcalc.xlsx and Kcalc.m. This screecast covers the use of Kcalc.xlsx for Example 17.4 and Example 17.5 of the textbook.

Comprehension Questions:

1. CO and H2 are fed in a 2:1 ratio to a reactor at 500K and 20 bars with a catalyst that favors only CH3OH as its product. Calculate ΔG_{R}º and ΔH_{R}º. 2. CO and H2 are fed in a 1:1 ratio to a reactor at 500K and 20 bars with a catalyst that favors only CH3OH as its product. Calculate ΔG_{R}º and ΔH_{R}º. 3. CO and H2 are fed in a 1:1 ratio to a reactor at 600K and 20 bars with a catalyst that favors only CH3OH as its product. Calculate ΔG_{R}º and ΔH_{R}º. 4. CO and H2 are fed in a 1:1 ratio to a reactor at 500K and 20 bars with a catalyst that favors only CH3OH as its product. Calculate ΔG_{T}º and ΔH_{T}º. Check your answer for ΔG_{T}º using the value given for K_{a }in Example 17.1. 5. CO and H2 are fed in a 1:1 ratio to a reactor at 600K and 10 bars with a catalyst that favors only CH3OH as its product. Calculate K_{a}, ΔG_{T}º and ΔH_{T}º. 6. CH3OH is fed to a reactor at 200ºC and 1 bar with a catalyst that produces CO and H2. Calculate K_{a}, ΔG_{T}º and ΔH_{T}º for this reaction and compare to the literature values given in Example 17.6 of Section 17.10. 7. CH3OH is fed to a reactor at 300ºC and 1 bar with a catalyst that produces CO and H2. Calculate K_{a} for this reaction and compare to the value given in Example 17.6 of Section 17.10. Give two reasons why the two estimates are not identical.

You can customize Kcalc.xlsx (uakron.edu, 17min) to facilitate whatever calculations you may need to perform. This presentation shows how to implement VLOOKUP to automatically load the relevant Hf, Gf, and Cp values. It also shows how to automatically use the Cp/R value when a,b,c,d values for Cp are not available. Finally, it shows how a fairly general table of inlet flows, temperatures, and pressures can be used to set up the equilibrium conversion calculation. The initial set up is demonstrated for the dimethyl ether process, then revised to initiate solution of Example 17.9 for ammonia synthesis.

Comprehension Questions:

1. The video shows how the shortcut Van't Hof equation can be written as lnKa=A+B/T. What are the values of A and B for the dimethyl ether process when a reference temperature of 633K is used? 2. The video shows how the shortcut Van't Hof equation can be written as lnKa=A+B/T. What are the values of A and B for the ammonia synthesis process when a reference temperature of 600K is used?

## Comments

Lira replied on Permalink

## Example 17.4 and 17.5 solved using Kcalc.xlsx (6:01)

Example 17.4 and 17.5 solved using Kcalc.xlsx (6:01) (msu.edu)

The full form of the temperature dependence of Ka is implemented in Kcalc.xlsx and Kcalc.m. This screecast covers the use of Kcalc.xlsx for Example 17.4 and Example 17.5 of the textbook.

Comprehension Questions:

1. CO and H2 are fed in a

2:1 ratioto a reactor at 500K and 20 bars with a catalyst that favors only CH3OH as its product. Calculate ΔGand Δ_{R}ºH._{R}º2. CO and H2 are fed in a

1:1 ratioto a reactor at 500K and 20 bars with a catalyst that favors only CH3OH as its product. Calculate ΔGand Δ_{R}ºH._{R}º3. CO and H2 are fed in a

1:1 ratioto a reactor at 600K and 20 bars with a catalyst that favors only CH3OH as its product. Calculate ΔGand Δ_{R}ºH._{R}º4. CO and H2 are fed in a

1:1 ratioto a reactor at 500K and 20 bars with a catalyst that favors only CH3OH as its product. Calculate ΔGand Δ_{T}ºH. Check your answer for Δ_{T}ºGusing the value given for_{T}ºKin Example 17.1._{a }5. CO and H2 are fed in a

1:1 ratioto a reactor at 600K and 10 bars with a catalyst that favors only CH3OH as its product. CalculateK, Δ_{a}Gand Δ_{T}ºH._{T}º6. CH3OH is fed to a reactor at 200

ºC and 1 bar with a catalyst that produces CO and H2. CalculateK, Δ_{a}Gand Δ_{T}ºHfor this reaction and compare to the literature values given in Example 17.6 of Section 17.10._{T}º7. CH3OH is fed to a reactor at 300

ºC and 1 bar with a catalyst that produces CO and H2. CalculateKfor this reaction and compare to the value given in Example 17.6 of Section 17.10. Give two reasons why the two estimates are not identical._{a}Elliott replied on Permalink

## Kcalc Bells&Whistles

You can customize Kcalc.xlsx (uakron.edu, 17min) to facilitate whatever calculations you may need to perform. This presentation shows how to implement VLOOKUP to automatically load the relevant Hf, Gf, and Cp values. It also shows how to automatically use the Cp/R value when a,b,c,d values for Cp are not available. Finally, it shows how a fairly general table of inlet flows, temperatures, and pressures can be used to set up the equilibrium conversion calculation. The initial set up is demonstrated for the dimethyl ether process, then revised to initiate solution of Example 17.9 for ammonia synthesis.

Comprehension Questions:

1. The video shows how the shortcut Van't Hof equation can be written as lnKa=A+B/T. What are the values of A and B for the dimethyl ether process when a reference temperature of 633K is used?

2. The video shows how the shortcut Van't Hof equation can be written as lnKa=A+B/T. What are the values of A and B for the ammonia synthesis process when a reference temperature of 600K is used?