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Unformatted text preview: alexander (jra2623) – Homework 3 – sutcliffe – (51045) 1 This printout should have 18 questions. Multiplechoice questions may continue on the next column or page – find all choices before answering. NOTE: Even if you are not asked to, WRITE the expression for the equilibrium constant and/or reaction quotient to see what concentration /partial pressure values you need. There are some equilibrium calcula tions which may need the quadratic formula. This HW covers Chapter 6 up to Le Chatal ier’s Principle. 001 10.0 points What is the equilibrium expression for the following equation? Assume that all species here are gases. A + 3 B ⇀ ↽ 2 C + D 1. 2 [C] [D] 3 [A] [B] 2. [C] 2 [D] [A] [B] 3 correct 3. [A] [B] 3 [C] 2 [D] 4. 3 [A] [B] 2 [C] [D] Explanation: Equilibrium expressions are written with the products (raised to the powers of their co efficients) in the numerator and the reactants (raised to the powers of their coefficients) in the denominator. 002 10.0 points What is the form of the equilibrium constant for the process PbO(s) + CO 2 (g) ⇀ ↽ PbCO 3 (s) ? P species means the pressure of species. 1. K p = [PbCO 3 ] [PbO] P CO 2 2. K p = P PbCO 3 P CO 2 3. No other choice is correct. 4. K c = [PbCO 3 ] 2 [CO 2 ] [PbO] 5. K p = 1 P CO 2 correct Explanation: Solids are not included in the K expression. 003 10.0 points Consider the following reactions at 25 ◦ C: reaction K c 2 NO(g) ⇀ ↽ N 2 (g) + O 2 (g) 1 × 10 30 2 H 2 O(g) ⇀ ↽ 2 H 2 (g) + O 2 (g) 5 × 10 − 82 2 CO(g) + O 2 (g) ⇀ ↽ 2 CO 2 (g) 3 × 10 91 Which compound is most likely to dissociate and give O 2 (g) at 25 ◦ C? 1. H 2 O 2. CO 2 3. CO 4. NO correct Explanation: Only two are dissociation reactions: disso ciation of NO and dissociation of H 2 O. K c is greater for dissociation of NO. 004 10.0 points The equilibrium constant for the reaction 4 NH 3 (g) + 5 O 2 (g) → 4 NO(g) + 6 H 2 O(g) is K . Calculate the equilibrium constant for the reaction 2 NO(g) + 3 H 2 O(g) → 2 NH 3 (g) + 5 2 O 2 (g) . 1. 1 K 2. K 2 3. 2 K alexander (jra2623) – Homework 3 – sutcliffe – (51045) 2 4. 1 √ K correct 5. K Explanation: 005 10.0 points If the equilibrium constant for the reaction Ni(s) + 4 CO(g) → Ni(CO) 4 (g) is 2.72 at a certain temperature, what is the equilibrium constant for the reaction Ni(CO) 4 (g) → Ni(s) + 4 CO(g) at the same temperature?...
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 Fall '07
 Holcombe
 Equilibrium, Kc

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