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Unformatted text preview: 2) Change in pressure N 2 O 4 2NO P = nRT/V; Pressure can be reduced by shifting the equilibrium to the left What happens if the volume is decreased by ½? WE see that in response to an increase in total pressure, the equilibrium shifts to the left 3) Change in Temeprature Need to know some thermochemical data to make a prediction H 2 + I 2 2HI ∆H= -10.46 kJ/mol If the temperature increases, less HI is formed, and the euqiloibrum shifts to the left If the temperature decreases, more HI is formed, and the equilibrium shifts to the right In accord with Le Chatelier’s principle: the reaction shifts in a direction to counter the effect of added heat Temperature & Le Chatlier’s Principle Quantitative Insight: requires a relationship between K and ∆H 10/29/09 Cl 2 2Cl ∆H=243.5 kJ/mol at 600 K K p- 4.8 x 10-16...
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