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Unformatted text preview: the system. For a reaction in which there is no change in the number of molecules when reaction occurs, a volume change will not lead to a change in the relative amounts of reactants and products, because the equality Q = K will not be disturbed.
Apply Le Chatelier’s principle Consider the change of concentration caused by the volume change Not the volume change itself! 7 Effect of Change in Volume
Kc = [G]g[H]h [C]c[D]d = nG nH
g h Effect of the Change of Volume
V(a+b)-(g+h) a a nA nB = nG nH g h a a nA nB V-Δn When the volume of an equilibrium mixture of gases is reduced, a net change occurs in the direction that produces fewer moles of gas. When the volume is increased, a net change occurs in the direction that produces more moles of gas. ntot = KP = 1.16 mol gas 415 1.085 mol gas 338 Effect of Condition Changes Adding a gaseous reactant or product changes Pgas. Adding an inert gas changes the total pressure. Relative partial pressures are unchanged. Changing the volume of the system causes a change in the equilibrium position...
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- Spring '11