Question

Problem Set 12 October 16, 2019 CHEM 1252 Textbook Reading Assignment: 14.1-5 Additional Practice Problems: 14.1,7,13,17,19,23,25,29,31,41-42,47,53,55,58,61 1. What does it mean when we say that chemical equilibrium is a dynamic process? 2. Write an expression for Kor K, (whichever is more appropriate) for each of the following reactions, and give typical units (if any) for the equilibrium constant. (a)Na(e) + O2(g) - 2 NO(g) (b) 2012(g) + 2H2008) - 4HCI(g) + O2(g) (c) 1(aq) + L.(ag)- 1(ag) 3. The equilibrium-constant expression for a reaction depends only on the stoichiometry of the overall reaction, not on its detailed mechanism. Explain why this is so. 4. Equilibrium constants for gas-phase reactions are best defined using partial pressures. Show how to use the ideal gas law to convert a partial pressure in atm to concentration in mol/L.

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Answer 1

1. It means reactant is always getting converted to product and product is converted to reactant but the amount of reactant converted to product and product converted to reactant is equel at equilibrium. so although the process in continuous (dynamic) the net amount of reactant and product is fixed at equilibrium. 2. for reactions involving gases express equilibrium contant in it is more convenient to terms of partial pressure. a) Nr. (g) ta(a) 2NO(s) kp = (Pro)? [PN 2] [Por] b) 2chce+2420 6 = 4 HCl(s) ta (6) kp = (Pres) * (bo) (Peru)? (PH20) () (lar) + le case) = 15 cap.) ke : [15] [1] [12] 3." The equilibrium costant is expressed as the Concentrations at product over the reactants when the system is at equilibrium. So it do not depends on the mechanism of the reaction only depends on the stoichiometrical Coefficients

4) Cacoas caco - Cao (s) + Co. ) PV=nRT P = ART P=CRT kea [co ] Pear=[co] RT Ke= (pon) kp= [co₂]RT kp = kc (RT) [co]=ke for a general reaction a A + bB - C + dD kp = (!?) (68) [c] [old (RT)(C+2) (PA) (P) [A]a[B]" (RT)1976) kp = [c]• [D]" (RT (C+ d)- (a+b) [A]a[B]S tp = [c]" [p]" (RT) on [A]a[B]6 . Tko a ke (RTjon] An= (no. of moles of gascous Product - no. of moles of gaseous reactant) In the above reaction anal so kp=ke RT