ex3 - CHEMISTRY 13 EXAM 3 April 4, 2006 FORM A -1. For the...

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CHEMISTRY 13 EXAM 3 April 4, 2006 FORM A ---------------------------------------------------------------------------------------------- 1. For the following combustion reaction which of the following statements are true? C 4 H 10 (g) + 13/2 O 2 (g) 4 CO 2 (g) + 5 H 2 O(g) I Δ S rxn is positive. II Δ H rxn is positive. III Δ G rxn is positive A. only I is true B. only II is true C. I and II are true D. All three are false E. I is true and III is true at low temperature. ------------------------------------------------------------------------------------------------- 2. Estimate the value of Δ G° at 373 K for the oxidation of solid elemental sulfur to gaseous sulfur dioxide. S (s, rhombic) + O 2 (g) SO 2 (g) At 298K, Δ H° for this reaction is 269.9 kJ/mol, and Δ S° is +11.6 J/K. A. 300.4 kJ/mol B. +300.4 kJ/mol C. 4,597 kJ/mol D. +4,597 kJ/mol E. 274.2 kJ/mol ---------------------------------------------------------------------------------------------- 3. Which one of the metals below would make the best lining for a storage tank of nitric acid? A. iron B. tin C. nickel D. copper E. zinc
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Use the table below to answer the next question. Thermodynamic Quantities for Selected Substances at 298.15 K (25°C) Substance Δ f (kJ/mol) Δ f (kJ/mol) S (J/K-mol) Carbon C (s, diamond) 1.88 2.84 2.43 C (s, graphite) 0 0 5.69 C 2 H 2 (g) 226.7 209.2 200.8 CO (g) -110.5 -137.2 197.9 CO 2 (g) -393.5 -394.4 213.6 Hydrogen H 2 ( g) 0 0 130.58 Oxygen O 2 (g) 0 0 205.0 H 2 O (l) -285.83 -237.13 69.91 ----------------------------------------------------------------------------------------------- 4. What is Δ S for the following reaction? 2C 2 H 2 (g) + 5O 2 (g) 4CO 2 (g) + 2H 2 O (l) A. +689.3 J/K B. +122.3 J/K C. +432.4 J/K D. 122.3 J/K E. 432.4 J/K ----------------------------------------------------------------------------------------------- 5. Which one of the following has the largest entropy in the gas phase at 25 °C and 1 atm? A. H 2 B. C 2 H 5 Cl C. Ar D. CH 4 E. Cl 2 -------------------------------------------------------------------------------------------------
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---------------------------------------------------------------------------------------------------- 6. Which of the following have a standard Gibbs free energy of formation of zero? (a)
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This note was uploaded on 07/23/2008 for the course CHEM 112 taught by Professor Vandersluys,lorschmid,kylem during the Fall '07 term at Pennsylvania State University, University Park.

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ex3 - CHEMISTRY 13 EXAM 3 April 4, 2006 FORM A -1. For the...

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