Ch.15 - Chemical Equilibrium
Chapter 15, Problem 128
The following reaction is important in gold mining: 4 Au1s2 + 8 CN-1aq2 + O21g2 + 2 H2O1l2 ∆ 4 Au1CN22-1aq2 + 4 OH-1aq2For a reaction mixture at equilibrium, in which direction would the reaction go to reestablish equilibrium after each of the following changes? (a) Adding gold
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Textbook Question
Consider the following equilibrium: Ag+(aq) + Cl-(aq) ⇌ AgCl(s) Use Le Châtelier's principle to predict how the amount of solid silver chloride will change when the equilibrium is disturbed by: (d) Removing Cl-; also account for the change using the reaction quotient Qc
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Textbook Question
For the water–gas shift reaction
CO1g2 + H2O1g2 ∆ CO21g2 + H21g2, ΔH° = - 41.2 kJ
does the amount of H2 in an equilibrium mixture increase or decrease when the temperature is increased? How does Kc change when the temperature is decreased? Justify your answers using Le Châtelier's principle.
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Textbook Question
Consider the exothermic reaction
CoCl 2-1aq2 + 6 H O1l2 ∆ Co1H O2 2 + 1aq2 + 4 Cl-1aq2 which interconverts the blue CoCl 2- ion and the pink
Co 2 +CoCl 2- increase or decrease when the following changes occur?(c) The solution is diluted with water.
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Textbook Question
The equilibrium constant Kp for the reaction PCl51g2 ∆ PCl31g2 + Cl21g2 is 3.81 * 102 at 600 K and 2.69 * 103 at 700 K.
(b) How are the equilibrium amounts of reactants and products affected by (iii) addition of a catalyst?
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Textbook Question
Baking soda (sodium bicarbonate) decomposes when it is heated:
2 NaHCO31s2 ∆ Na2CO31s2 + CO21g2 + H2O1g2
ΔH° = + 136 kJ
Consider an equilibrium mixture of reactants and products in a closed container. How does the number of moles of CO2 change when the mixture is disturbed by the following:
(b) Adding water vapor
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Textbook Question
A platinum catalyst is used in automobile catalytic convert- ers to hasten the oxidation of carbon monoxide:
2 CO1g2 + O 1g2 ∆Pt 2 CO 1g2 ΔH° = - 566 kJ
Suppose that you have a reaction vessel containing an equilibrium mixture of CO1g2, O21g2, and CO21g2. Under the following conditions, will the amount of CO increase, decrease, or remain the same?
(e) The pressure is increased by adding O2 gas.
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