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Adamson University

College of Engineering and Technology

Chemical Engineering Department

Gibbs Free Energy

SEATWORK

1. Calculate G at 25 C for the following fermentation reaction:

The standard Gibbs energies of formation of glucose, ethanol, and carbon dioxide are given in Appendix of your textbook.

Also use the data in Appendix to calculate S for the fermentation reaction.2. The latent heat of vaporization of water at 100 C is 40.6 kJ mol1and when 1 mol of water is vaporized at 100 C and 1 atm

pressure, the volume increase is 30.19 dm3. Calculate the work done by the system, the change in internal energy U, the

change in Gibbs energy G and the entropy change S.

3. At 25 C 1 mol of an ideal gas is expanded isothermally from 2 to 20 dm3. Calculate U, H, S, A, and G.

4. The values of H and S for a chemical reaction are 85.2 kJ mol1and 170.2 J K1mol1, respectively, and the

values can be taken to be independent of temperature.

a. Calculate G for the reaction at (a) 300 K, (b) 600 K, and (c) 1000 K.

b. At what temperature would G be zero?

Adamson University

College of Engineering and Technology

Chemical Engineering DepartmentGibbs Free Energy

SEATWORK

1. Calculate G at 25 C for the following fermentation reaction:

The standard Gibbs energies of formation of glucose, ethanol, and carbon dioxide are given in Appendix of your textbook.

Also use the data in Appendix to calculate S for the fermentation reaction.

2. The latent heat of vaporization of water at 100 C is 40.6 kJ mol1and when 1 mol of water is vaporized at 100 C and 1 atm

pressure, the volume increase is 30.19 dm3. Calculate the work done by the system, the change in internal energy U, the

change in Gibbs energy G and the entropy change S.

3. At 25 C 1 mol of an ideal gas is expanded isothermally from 2 to 20 dm3. Calculate U, H, S, A, and G.

4. The values of H

and S

for a chemical reaction are 85.2 kJ mol1

and 170.2 J K1

mol1

, respectively, and thevalues can be taken to be independent of temperature.

a. Calculate G for the reaction at (a) 300 K, (b) 600 K, and (c) 1000 K.

b. At what temperature would G be zero?

Adamson University

College of Engineering and Technology

Chemical Engineering Department

Gibbs Free Energy

SEATWORK

1. Calculate G at 25 C for the following fermentation reaction:

The standard Gibbs energies of formation of glucose, ethanol, and carbon dioxide are given in Appendix of your textbook.

Also use the data in Appendix to calculate S for the fermentation reaction.

2. The latent heat of vaporization of water at 100 C is 40.6 kJ mol1and when 1 mol of water is vaporized at 100 C and 1 atm

pressure, the volume increase is 30.19 dm3. Calculate the work done by the system, the change in internal energy U, the

change in Gibbs energy G and the entropy change S.

3. At 25 C 1 mol of an ideal gas is expanded isothermally from 2 to 20 dm3. Calculate U, H, S, A, and G.

4. The values of H and S for a chemical reaction are 85.2 kJ mol1and 170.2 J K1mol1, respectively, and the

values can be taken to be independent of temperature.

a. Calculate G for the reaction at (a) 300 K, (b) 600 K, and (c) 1000 K.

b. At what temperature would G be zero?