# topic14 - XIV. Equilibrium 1. Cu(s) + 2Ag+ Cu2+ + 2Ag(s) If...

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XIV. Equilibrium 1. Cu (s) + 2Ag + Cu 2+ + 2Ag (s) If the equilibrium constant for the reaction above is 3.7x10 15 , which of the following correctly describes the standard voltage, E o and the standard free energy change, G o , for this reaction? (A) E o is positive and G o is negative (B) E o is negative and G o is positive (C) E o and G o are both positive (D) E o and G o are both negative (E) E o and G o are both zero Answer: A 2. How many moles of NaF must be dissolved in 1.00 liter of a saturated solution of PbF 2 at 25 o C to reduce the [Pb 2+ ] to 1x10 -6 molar? (K sp PbF 2 at 25 o C= 4.0x10 -8 ) (A) 0.02 mole (B) 0.04 mole (C) 0.10 mole (D) 0.20 mole (E) 0.40 mole Answer: D 3. In which of the following systems would the number of moles of the substances present at equilibrium NOT be shifted by a change in the volume of the system at a constant temperature? (A) CO (g) + NO (g) CO 2(g) + ½N 2(g) (B) N 2(g) + 3H 2(g) 2NH 3(g) (C) N 2(g) + 2O 2(g) 2NO 2(g) (D) N 2 O 4(g) 2NO 2(g) (E) NO (g) + O 3(g) NO 2(g) + O 2(g) Answer: E 4. Which of the following is the correct equilibrium expression for the hydrolysis of CO 3 2- ? (A) K= [HCO 3 - ] / [CO 3 2- ][H 3 O + ] (B) K= [HCO 3 - ][OH - ] / [CO 3 2- ] (C) K= [CO 3 2- ][OH - ] / [HCO 3 - ] (D) K= [CO 3 2- ] / [CO 2 ][OH - ] (E) K= [CO 3 2- ][H 3 O + ] / [HCO 3 - ] Answer: B

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5. H 2 PO 4 - + HBO 3 2- HPO 4 2- + H 2 BO 3 - The equilibrium constant for the reaction represented by the equation above is greater than 1.0. Which of the following gives the correct relative strengths of the acids and bases in the reaction? Acids
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## This note was uploaded on 01/03/2011 for the course CHEM 1442 taught by Professor Rogers during the Spring '08 term at UT Arlington.

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topic14 - XIV. Equilibrium 1. Cu(s) + 2Ag+ Cu2+ + 2Ag(s) If...

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