100902Chem116lecture

100902Chem116lecture - LeChatelier's Principle A perturbed...

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LeChatelier’s Principle: A perturbed equilibrium will react so as to minimize the effect • Add or remove a species? • convert some of the addition • make more of what’s lost (applies to energy too) • Increase or decrease pressure? • consume or make moles of gas if possible (relieve or generate pressure) P 1 /V • addition of inert gas has no effect
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C ( s ) + 2 N 2 O ( g ) CO 2 ( g ) + 2 N 2 ( g ) If the equilibrium below is in a vessel whose volume is decreased by half, how will it respond? 8 H 2 ( g ) + S 8 ( s ) 8 H 2 S ( g ) If the equilibrium below is in a vessel whose volume is decreased by half, how will it respond? no change NOTE: Adding an inert gas to an equilibrium in a fixed volume does not affect the equilibrium - the pressure increases, but the relative partial pressures of the products/reactants don’t change
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2 ( g ) + Br 2 ( g ) 2 HBr ( g ) H ° = -103.7 kJ Change reactions shifts toward? Add some H
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100902Chem116lecture - LeChatelier's Principle A perturbed...

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