Problem Set 7 Chapter 16 Chemical Equilibrium 1 The equilibrium constant for the reaction What is the equilibrium constant for H2 g I2 g 2 HI g is 54 9 at 699 0 K Kelvin 4 HI g 2 H2 g 2 I2 g under the same conditions Note the indicates the equilibrium double arrow 2 NO g Cl2 g 2 NOCl g NO2 g NO g O2 g Kc 3 93 Kc 3 20 X 10 3 calculate a value for Kc for the reaction NOCl g O2 g NO2 g Cl2 g A 109 8 B 0 00911 C 109 8 D 0 0182 E 0 000332 2 Using this data A 20 2 B 2 06 X 10 4 C 4 49 D 4 84 X 10 3 E 0 223 3 The equilibrium constant Kc for the system CaO s CO2 g CaCO3 s is A Kc CaO CO2 CaCO3 B Kc ICO2 C Kc CaCO3 CaO D Kc CaCO3 CaO CO2 E Kc 1 CO2 4 For the reaction 2 SO2 g O2 g 2 SO3 g at 450 0 K Kelvin the equilibrium constant Kc has a value of 4 62 A system was charged to give these initial concentrations SO3 0 254 M and O2 0 00855 M and SO2 0 500 M In which direction will it go A to the right B to the left C it will remain at the same concentrations D not enough data to tell 5 For the reaction system 2 H2O g O2 g 2 H2O2 g the equilibrium concentrations are H2O2 0 120 M H2O 0 860 M O2 0 330 M Calculate the value of Kc for this reaction A 0 423 B 0 872 C 0 0590 D 1 31 E 2 51 6 For the reaction system 2 SO2 g O2 g 2 SO3 g Kc has a value of 4 62 at 450 0 K Kelvin A system at equilibrium has the following concentrations SO3 0 254 M O2 0 00855 M What is the equilibrium concentration of SO2 A 2 75 M B 1 63 M C 2 66 M D 0 612 M E 1 28 M A 1 97 moles B 0 337 moles C 0 394 moles D 0 266 moles E 0 0531 moles 7 A study of the system H2 g I2 g 2 HI g was carried out Kc 54 9 at 699 0 K Kelvin for this reaction A system was charged with 2 50 moles of HI in a 5 00 liter vessel as the only component initially The system was brought up to 699 0 K and allowed to reach equilibrium How many moles of H2 should there be in the container at that time 8 The reaction 2 SO3 g 2 SO2 g O2 g is endothermic Predict what will happen if the temperature is increased A the pressure decreases B more SO3 g is produced C Kc increases D Kc decreases E none of the above 9 For the system CaO s CO2 g CaCO3 s I added 1 00 mol of CaO s to 1 00L of 0 500M CO2 g at 200 oC At equilibrium the CO2 0 150M What is the value of Kp for this reaction A 0 172 B 0 150 C 5 82 D 6 67 E 2 59 10 Look at problem 26 on page 750 of the text Which of the four choices would produce more products in the reaction The choices are A only one of these B choices a and b C choices c and d D choices a b and c E all four choices ANSWERS 1 E 2 C 3 E 4 B 5 C 6 E 7 D 8 C 9 A 10 A