ࡱ> Z\Y `bjbj nee$||4    \f, ^Hm  $X mmp o.0^!A!!8^!| : Equilibrium Expression Problems #1 Solve each problem and show all of your work. 1. SO3(g) + H2O(g) ! H2SO4(l) At equilibrium [SO3] = 0.400M [H2O] = 0.480M [H2SO4] = 0.600M Calculate the value of the equilibrium constant. 2. At equilibrium at 100oC, a 2.0L flask contains: 0.075 mol of PCl5 0.050 mol of H2O 0.750 mol 0f HCl 0.500 mol of POCl3 Calculate the Keq for the reaction: PCl5 (s) + H2O (g) ! 2HCl (g) + POCl3 (g) 3. Keq= 798 at 25oC for the reaction: 2SO2 (g) + O2 (g) ! 2SO3 (g). In a particular mixture at equilibrium, [SO2]= 4.20 M and [SO3]=11.0M. Calculate the equilibrium [O2] in this mixture at 25oC. 4. Consider the following equilibrium: 2SO2 (g) + O2 (g) ! 2SO3 (g) 0.600 moles of SO2 and 0.600 moles of O2 are present in a 4.00 L flask at equilibrium at 100oC. If the Keq = 680, calculate the SO3 concentration at 100oC. 5. Consider the following equilibrium: 2 NO2(g) ! N2O4(g) 2.00 moles of NO2 and1.60 moles of N2O4 are present in a 4.00 L flask at equilibrium at 20oC. Calculate the Keq at 20oC . 6. 2 SO3(g) ! 2 SO2(g) + O2(g) 4.00 moles of SO2 and 5.00 moles O2 are present in a 2.00 L container at 100oC and are at equilibrium. Calculate the equilibrium concentration of SO3 and the number of moles SO3 present if the Keq = 1.47 x 10-3. 7. If at equilibrium [H2] = 0.200M and [I2] = 0.200M and Keq=55.6 at 250oC, calculate the equilibrium concentration of HI. H2 (g) + I2 (g) ! 2HI (g) 8. 1.60 moles CO, 1.60 moles H2O, 4.00 moles CO2, 4.00moles H2 are found in a 8.00L container at 690oC at equilibrium. CO (g) + H2O (g) ! CO2 (g) + H2 (g) Calculate the value of the equilibrium constant. Worksheet B Equilibrium Calculations Solve each problem and show all of your work. 1. At equilibrium, a 5.0L flask contains: 0.75 mol of PCl5 0.50 mol of H2O 7.50 mol of HCl 5.00 mol of POCl3 Calculate the Keq for the reaction: PCl5 (s) + H2O (g) ! 2HCl (g) + POCl3 (g) 2. Keq= 798 for the reaction: 2SO2 (g) + O2 (g) ! 2SO3 (g). In a particular mixture at equilibrium, [SO2]= 4.20 M and [SO3]=11.0 M. Calculate the equilibrium [O2] in this mixture. 3. Consider the following equilibrium: 2SO2 (g) + O2 (g) ! 2SO3 (g) When a 0.600 moles of SO2 and 0.600 moles of O2 are placed into a 1.00 litre container and allowed to reach equilibrium, the equilibrium [SO3] is to be 0.250M. Calculate the Keq value. 4. Consider the following equilibrium: 2 NO2(g) ! N2O4(g) If 2.00 moles of NO2 are placed in a 1.00 L flask and allowed to react. At equilibrium 1.80 moles NO2 are present. Calculate the Keq. 5. 2 SO2(g) + O2(g) ! 2 SO3(g) 4.00 moles of SO2 and 5.00 moles O2 are placed in a 2.00 L container at 200oC and allowed to reach equilibrium. If the equilibrium concentration of O2 is 2.00 M, calculate the Keq 6. If the initial [H2] = 0.200M, [I2] = 0.200M and Keq = 55.6 at 250oC calculate the equilibrium concentrations of all molecules. H2 (g) + I2 (g) ! 2HI (g) 7. 1.60 moles CO and1.60 moles H2O are placed in a 2.00L container at 690 oC (Keq=10.0). Calculate all equilibrium concentrations. CO (g) + H2O (g) ! CO2 (g) + H2 (g) 8. SO3(g) + NO(g) ! NO2(g) + SO2(g) Keq = 0.800 at 100oC. If 4.00 moles of each reactant are placed in a 2.00L container, calculate all equilibrium concentrations at 100oC. 9. Consider the following equilibrium system: 2NO2(g) ! N2O4 Two sets of equilibrium data are listed for the same temperature. Container 1 2.00 L 0.12 moles NO2 0.16 moles N2O4 Container 2 5.00 L 0.26 moles NO2 ? moles N2O4 Determine the number of moles N2O4 in the second container. Get a Keq from the first container and use it for the second container. Worksheet C Equilibrium Calculations Solve each problem and show all of your work in your portfolio. 1. At equilibrium, a 2.0 L flask contains: 0.200 mol of PCl5 0.30 mol of H2O 0.60 mol of HCl 0.300 mol of POCl3 Calculate the Keq for the reaction: PCl5 (g) + H2O (g) ! 2HCl (g) + POCl3 (g) 2. Keq= 798 for the reaction: 2SO2 (g) + O2 (g) ! 2SO3 (g). In a particular mixture at equilibrium, [SO2]= 4.20 M and [SO3]= 11.0M. Calculate the equilibrium [O2] in this mixture. 3. Consider the following equilibrium: 2SO2 (g) + O2 (g) ! 2SO3 (g) When a 0.600 moles of SO2 and 0.600 moles of O2 are placed into a 2.00 litre container and allowed to reach equilibrium, the equilibrium [SO3] is to be 0.250M. Calculate the Keq value. 4. H2 (g) + S (s) ! H2S (g) Keq= 14 0.60 moles of H2 and 1.4 moles of S are placed into a 2.0L flask andDF  & ( 2 4 8 @     ] ` ~    B Q S Z [  " & , . 2 ` b > @ b d ܼܼܼhP:hP:CJH*aJhP:hP:CJH*aJ hP:hP:CJOJQJ^JaJhP:hP:5CJH*\aJhP:hP:5CJ\aJhP:hP:CJaJhWU65CJ\aJ@FV ]  B . 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