CH302 Homework 3-solutions

CH302 Homework 3-solutions - Bodet (ngb299) Homework 3...

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Unformatted text preview: Bodet (ngb299) Homework 3 sutcliffe (51630) 1 This print-out should have 18 questions. Multiple-choice 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- iers 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. [C] 2 [D] [A] [B] 3 correct 2. 2 [C] [D] 3 [A] [B] 3. 3 [A] [B] 2 [C] [D] 4. [A] [B] 3 [C] 2 [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. No other choice is correct. 2. K c = [PbCO 3 ] 2 [CO 2 ] [PbO] 3. K p = P PbCO 3 P CO 2 4. K p = [PbCO 3 ] [PbO] P CO 2 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 3. NO correct 4. CO 2 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.- K 2 2. 1 K 3.- K Bodet (ngb299) Homework 3 sutcliffe (51630) 2 4. 1 K correct 5.- 2 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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CH302 Homework 3-solutions - Bodet (ngb299) Homework 3...

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