Lect+20+08 - Lecture Goals • You will have a plain...

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Unformatted text preview: Lecture Goals • You will have a plain language understanding of the effect of stress on equilibrium conditions (LeChatelier) • You will be able to use the reaction quotient to solve equilibrium problems. • You will be able to use the enthalpy of reaction to determine the temperature dependence of equilibrium constants for reactions and phase changes. • You will have a plain language understanding of the basis for Extraction and Separation Processes External Effects on Equilibrium • A system in equilibrium subject to stress will react in a way that tends to counteract the stress - Le Chatelier • You will be able to describe the effect of reactant / product pressure(concentration) changes • You will be able to describe the effect of changes in reactor volume • You will be able to describe the effect of changes in Temperature • H 2 (g) + I 2 (g) ↔ 2HI(g) • Initial conditions - no product initially • With time equilibrium conditions are established • Stress - Add hydrogen- no longer at equilibrium - with time equilibrium re- established • Re-equilibration reduces hydrogen and increases HI(g) Time → • Sealed isothermal system with moveable piston • 2P 2 (g) ↔ P 4 (g) at equilibrium • Expand - decrease pressure - increase dissociation • Compress - increase pressure - decreased dissociation Effect of Temperature on Equilibria • 2NO 2 (g) ↔ N 2 O 4 (g) 2200 ∆ H = -58.02 kJ/mol - Reaction as written is exothermic • Q = ( P N2O4 )/(P NO2 ) 2 • K = 8.8 at 298 K Equilibrium constant (in atm) decreases with increasing temperature because exothermic equilibrium. • At 25C more N 2 O 4 or NO 2 ? • So with increasing temperature? ?...
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Lect+20+08 - Lecture Goals • You will have a plain...

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