Homework #4-solutions

Homework #4-solutions - gonzales(pag757 Homework#4...

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gonzales (pag757) – Homework #4 – Holcombe – (52460) 1 This print-out should have 10 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. 001 10.0 points ±or the heterogeneous reaction 2 MnO 2 (s) 2 MnO(s) + O 2 (g) , the equilibrium constant expression For K c is which oF the Following? 1. K c = [MnO 2 ] [MnO] [O 2 ] 2. K c = [MnO] [O 2 ] [MnO 2 ] 3. K c = k [MnO 2 ] 4. K c = [O 2 ] correct 5. K c = 1 [O 2 ] Explanation: ±or heterogeneous reactions, only gaseous reactants and species are taken into considera- tion when writing K c expressions. ThereFore, K c = [O 2 ]. 002 10.0 points Which oF the Following is TRUE? 1. A small value oF K means that the equilib- rium concentrations oF the reactants are small compared to the equilibrium concentrations oF the products. 2. When the value oF K is small, the equi- librium lies on the product side oF the equilib- rium reaction. 3. A large value oF K means that the equi- librium concentrations oF products are large compared to the equilibrium concentrations oF the reactants. correct 4. When the value oF K is large, the equilib- rium lies on the reactant side oF the equilib- rium reaction. 5. When the value oF Q is large, the equilib- rium lies on the product side oF the equilib- rium reaction. Explanation: 003 10.0 points The equilibrium constant For the reaction HNO 2 (aq) + H 2 O( ) NO 2 (aq) + H 3 O + (aq) is 4 . 3 × 10 4 at 25 C. Will nitrous acid
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This note was uploaded on 03/15/2010 for the course CH 52460 taught by Professor Holcombe during the Spring '10 term at University of Texas.

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Homework #4-solutions - gonzales(pag757 Homework#4...

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