03 HW - Quantitative Gibbs

03 HW - Quantitative Gibbs - C 2 H 6(g 2Cl 2(g → C 2 H 4...

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Name: _________________________________________ Date: ____________ WKST #5: Quantitative Gibb’s Free Energy (50 points) Period: __________ 1. What are the two formulas that can be used to calculate Gibb’s Free Energy? 2. What information does Gibb’s Free Energy provide about a reaction? Follow the procedure below to answer each of the long answer questions to receive full credit. Write the formula Substitute the appropriate numbers Solve the problem and include the appropriate units Place a BOX around your answer so I can find it easily 3. Given the following reactions (at 298 K and 1 atm) and the thermodynamic data below, which reaction will be spontaneous? Support your answer mathematically. a. CH 3 OH (l) + 3/2 O 2 (g) → CO 2 (g) + 2 H 2 O (g) ΔH = -638.4 kJ/mol ΔS = 156.9 J/mol K b. 2 NO 2 (g) → N 2 O 4 (g) ΔH = - 57.2 kJ/mol ΔS = -275.9 J/mol K 4. Given the following reaction (at 298 K and 1 atm) and the thermodynamic data below:
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Unformatted text preview: C 2 H 6 (g) + 2Cl 2 (g) → C 2 H 4 Cl 2 (g) + 2 HCl (g) Substance C 2 H 6 Cl 2 C 2 H 4 Cl 2 HCl G (kJ/mol) -32.9 0 -80.3 -95.2 a. Solve for G of the reaction. Is this reaction spontaneous or non-spontaneous? How can you tell? 5. Given the following reaction and thermodynamic data at 298 K and 1 atm: 3 Fe 2 O 3 (s) → 2 Fe 3 O 4 (s) + ½ O 2 (g) Substance H (kJ/mol) S (J/K mol) G (kJ/mol) Fe 2 O 3 (s) -825 87 -742 Fe 3 O 4 (s) -1118 146 -1015 O 2 (g) 0 205 0 a. Does the system experience an increase or decrease in entropy? Provide an explanation. b. What is the H for the reaction? Is the reaction exothermic or endothermic? c. What is the S for the reaction? Does the reaction cause an increase or decrease in entropy? d. What is the G for the reaction? Is the reaction spontaneous or non-spontaneous? e. What could you do to make this reaction occur spontaneously?...
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This note was uploaded on 01/01/2012 for the course CHEM 101 taught by Professor Donahue during the Spring '11 term at Long Island U..

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03 HW - Quantitative Gibbs - C 2 H 6(g 2Cl 2(g → C 2 H 4...

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