Practice Exam 3 Addendum

# Practice Exam 3 Addendum - 2 the change in internal energy...

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Practice Exam 3 Addendum, Chapter 17 Questions A (CHAP 17) One mole of an ideal gas at 300 K expands from 2.0 L to 9.0 L against a constant external pressure of 1.8 atm. The work done by this expansion is (in L·atm): 1. 0 2. -(1)(0.0821)(300)ln 3. -(300)(4.5)(1.8) 4. -(1.8)(9.0 - 2.0) 5. -(0.0821)(300) B (CHAP 17) Which of the following reactions has the largest positive entropy change? 1. PCl 3 (g) + Cl 2 (g) PCl 5 (g) 2. 2N 2 (g) + O 2 (g) 2N 2 O(g) 3. 2NO 2 (g) 2NO(g) + O 2 (g) 4. CO 2 (g) O 2 (g) + C(s) 5. H 2 O(g) H 2 O(l) C (CHAP 17) "A spontaneous change is always accompanied by an increase in entropy." The entropy change referred to in this statement is: 1. S system 2. S universe 3. S reversible 4. s surroundings 5. none of these D (CHAP 17) The best measure of the spontaneity of a process is: 1. the change in the number of moles of gaseous species.

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Unformatted text preview: 2. the change in internal energy of the process. 3. the change in free energy of the process. 4. the change in enthalpy of the process. 5. the change in entropy of the process. 1. (CHAP 17) Given ∆ = -371.1 kJ/mol for SO 3 and ∆ = -300.3 kJ/mol for SO 2 , what is ∆ G° for the following reaction? 2SO 2 (g) + O 2 (g) → 2SO 3 (g). 2. (CHAP 17) For the reaction, PCl 5 (g) PCl 3 (g) + Cl 2 (g), k H° = +92.5 kJ and S° = +182 J/K at 298°K. Assuming iH° and u S° do not change with temperature, (a) calculate G° at 550°K, (b) is the reaction spontaneous or not? explain your choice. 3. (CHAP 17) The equilibrium constant for the reaction PCl 5 (g) PCl 3 (g) + Cl 2 (g) is K p = 2.2 x 10-7 at 25°C. Calculate G° for this reaction ....
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## This note was uploaded on 06/02/2011 for the course CHEM 112 taught by Professor Chen during the Spring '09 term at South Carolina.

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Practice Exam 3 Addendum - 2 the change in internal energy...

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