Last modified: Mon 01/25/2016 09:44:55 am
ACA

Oklahoma State University

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Answer all of the questions below. If you do not know an answer enter CNA. However, it will help me the most if you answer each question with your best intuition/idea about what would be a reasonable answer.


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1. Calculate rxn for the following reaction. (Here is a table that includes thermodynamic values.) (Note: Use the mathematical relationship )

C2H5OH(l) + 3O2(g) ---> 2CO2(g) + 3H2O(l)

kJ mol-1

2a. For the reaction

H2O(g) ---> H2(g) + 1/2O2(g)

H° is +242 kJ mol-1 and S° is +45 J mol-1 K -1.

Calculate G° for this reaction at 298 K. (Note: Use the mathematical equation G° = H° - TS°)

kJ mol-1

b) Is the reaction thermodynamically favored (thermodynamically favored) at 298 K? (Yes/No)

c) Is the reaction thermodynamically favored (thermodynamically favored) at 1000 K? (Yes/No)

d) Calculate the temperature at which the reaction becomes thermodynamically favored. K

3. Complete the following table

H° (kJ mol-1)

S° (J mol-1 K -1)

G° (kJ mol-1)

Temperature (K)

-

+

-

all temperatures

-

-

-

+

low temperature

high temperature

+

+

+

-

 

4. Is there anything about the questions that you feel you do not understand? List your concerns/questions.

5. If there is one question you would like to have answered in lecture, what would that question be?