Name: __________________________ Date: _____________ Version BPart 1. Calculation/Short Answer Problems.All work for the following problems must be done in THIS TEST BOOKLET to receive credit. Calculations done with no work will receive zero points. You work must be clear and logical AND SHOWN to receive maximum (or any) credit. A. For the reaction: SO2Cl2(g) →SO2(g) + Cl2(g) at 375 K, the equilibrium constant KPis 2.40. In an experiment, a sample of pure SO2Cl2gas is placed in a sealed reaction vessel. The initial pressure of SO2Cl2is 5.00 atm. The reaction is allowed to come to equilibrium. What are the final equilibrium pressures of all the gases? You must set up and use an equilibrium table.(Hint: the quadratic equation is needed.) (25 points) SO2Cl2(g) →SO2(g) + Cl2(g) initial 5.00 0 0 change −x +x +x equilibrium 5.00 −x x x () ()( )()222222SOClSO Cl22 2SO ClSOClPPxK = = 2.40P5.00 x x + 2.40x 12.00 = 02.40 2.404 112.002.40 7.33x = = 2(1)2x = 2.47 or 4.87P= 5.00 x = 5.00 2.47 = 2.53 atmP= x = 2.47 atmP =x==−−−±− −−−−2.47 atmPage 1
Version B Name_______________________________ Student ID_________________________ B. A chemist makes up a solution of ascorbic acid (vitamin C, with formula C6H8O6) in water. C6H8O6(aq) + H2O(l) ⇌C6H7O6−(aq) + H3O+(aq) Using a pH meter, she measures the pH of the solution at 2.5.
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