1Announcements•Regrades – Lab TA’s or head TA– Random photocopying of exams•Remember the Learning Skills CenterLast Time•Reaction quotient – Qpand Qc– Mathematical Relation to Kcand Kp– Q < K forward : Q > K reverse– Omit solids in heterogeneous systems•Equilibrium from initial conditions– Molar proportions– Equilibrium tablesEquilibrium TablesaA→ bBA BInitial concentration [A] [B]Change in conc. –ax +bxEquilibrium conc. [A] – ax [B] + bx•Use the definition for Kcand solve for x•Sign of x determined by Q and K←Example – Using “x”Kc= 54.6 at 700 K for the reaction of hydrogen with iodine gas to form HI(g). Suppose that 38.4 g of HI, 5.0 g of H2, and 26.8 g of I2are placed together in a 2 L container at this temperature. What are the concentrations of each substance at equilibrium?
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