H03- Chemical Equilibrium

H03- Chemical Equilibrium - fernandez (jf23742) H03:...

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Unformatted text preview: fernandez (jf23742) H03: Chemical Equilibrium McCord (90262) 1 This print-out should have 31 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 10.0 points An equilibrium in which processes occur con- tinuously, with NO NET change, is called 1. static equilibrium. 2. homogeneous equilibrium. 3. heterogeneous equilibrium. 4. dynamic equilibrium. 002 10.0 points Explain why equilibium constants are dimen- sionless. 1. They are not really dimensionless but we must treat them as such in order to be able to take ln K in the expression G =- RT ln K . 2. They are dimensionless because concen- trations and pressures have no units. 3. Every concentration or pressure that en- ters into K c or K p is really divided by the cor- responding concentration or pressure of the substance in its standard state. 4. The statement is not true. Equilibrium constants have units that involve some multi- ple of atmospheres or moles per liter. 5. They are dimensionless because the pres- sures or concentrations we put in are all for the substances in their standard states. 003 10.0 points Consider the reaction 2 HgO(s) 2 Hg( ) + O 2 (g) . What is the form of the equilibrium constant K c for the reaction? 1. K c = [Hg] 2 [O 2 ] 2. K c = [O 2 ] 3. K c = [Hg] 2 [O 2 ] [HgO] 2 4. K c = [O 2 ] [HgO] 2 5. None of the other answers is correct. 004 10.0 points The expression for K c for the reaction at equi- librium is 4 NH 3 (g) + 5 O 2 (g) 4 NO(g) + 6 H 2 O(g) 1. [NH 3 ] 4 [O 2 ] 5 [NO] 4 [H 2 O] 6 2. [NO] 4 [H 2 O ] 6 3. [NO] 4 [H 2 O] 6 [NH 3 ] 4 [O 2 ] 5 4. [NH 3 ] 4 [O 2 ] 5 005 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. CO 2. NO 3. CO 2 4. H 2 O 006 10.0 points At 600 C, the equilibrium constant for the reaction 2 HgO(s) 2 Hg( ) + O 2 (g) is 2.8. Calculate the equilibrium constant for the reaction 1 2 O 2 (g) + Hg( ) HgO(s) . fernandez (jf23742) H03: Chemical Equilibrium McCord (90262) 2 1. 1.1 2. 1.7 3. 0.36 4.- 1 . 7 5. 0.60 007 10.0 points If K c = 2 . 89 10 5 for the reaction A(g) 2 B(g) , what is K c for the reaction written as 2 B(g) A(g) ?...
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This note was uploaded on 07/27/2009 for the course CH 90262 taught by Professor Mccord during the Spring '09 term at University of Texas at Austin.

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H03- Chemical Equilibrium - fernandez (jf23742) H03:...

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