CHE116_Lecture7_2011

CHE116_Lecture7_2011 - Chemistry Chemistry116 Lecture7...

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hemistry 116 Chemistry 116 Lecture 7 pics hâtelier’s rinciple Topics: Le Châtelier s Principle Chapter 15.7
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hâtelier’s rinciple Le Châtelier s Principle “ f a system at equilibrium is disturbed by a If a system at equilibrium is disturbed by a change in temperature, pressure, or the ncentration of one of the components the concentration of one of the components, the system will shift its equilibrium position so as counteract the effect of the disturbance ” to counteract the effect of the disturbance. e take advantage of Le hâtelier’s We take advantage of Le Châtelier s Principle to maximize product yield.
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Removing Products or Adding Reactants When a substance that is part of the equilibrium is added to the mixture, the equilibrium shifts to use it (in a direction that makes the substance a reactant). You could add an excess of a cheap/nontoxic reactant to force the reaction to the right and produce more product . N 2 (g) + 3 H 2 (g) NH 3 (g)
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The Haber Process If H 2 is added to the t N ill b system, N 2 will be consumed and the t ill two reagents will form more NH 3 .
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Removing Products or Adding Reactants When a substance that is part of the equilibrium is removed from the mixture, the equilibrium shifts to produce it (in a direction that makes the substance a product). You could cool the mixture to condense (liquefy) a product and remove it. N 2 (g) + 3H 2 (g) NH 3 (g) NH 3 (l) Changes in the partial pressure of substances that are part of the equilibrium are handled in the same way as adding or removing a substance.
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The Haber Process This apparatus helps push the equilibrium to the h t b i right by removing the ammonia H from the (NH 3 ) from the system as a liquid.
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Removing Products or Adding Reactants The following reaction is at equilibrium: COCl 2 ( g ) CO( g ) + Cl 2 ( g ) 1. Predict the direction of reaction when lorine gas is added the reaction mixture chlorine gas is added to the reaction mixture. 2. Predict the direction of reaction when carbon monoxide gas is removed from the mixture.
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Removing Products or Adding Reactants OCl CO( + Cl COCl 2 ( g ) g ) + Cl 2 ( g ) hen we add Cl he reaction will shift in the 1. When we add Cl 2
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CHE116_Lecture7_2011 - Chemistry Chemistry116 Lecture7...

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