lec13 - Announcements Regrades Lab TA's or head TA Random...

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1 Announcements • Regrades – Lab TA’s or head TA – Random photocopying of exams • Remember the Learning Skills Center Last Time • Reaction quotient – Q p and Q c – Mathematical Relation to K c and K p – Q < K forward : Q > K reverse – Omit solids in heterogeneous systems • Equilibrium from initial conditions – Molar proportions – Equilibrium tables Equilibrium Tables aA bB A B Initial concentration [A] [B] Change in conc. –ax +bx Equilibrium conc. [A] – ax [B] + bx • Use the definition for K c and solve for x • Sign of x determined by Q and K Example – Using “x” K c = 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 H 2 , and 26.8 g of I 2 are placed together in a 2 L container at this temperature. What are the concentrations of each substance at equilibrium?
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2 Example At 294.8 K, K c is 1.2x10 –4 for the decomposition of NH 4 HS(s). Calculate the equilibrium concentrations of NH
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lec13 - Announcements Regrades Lab TA's or head TA Random...

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