Be sure to answer all parts. The molecular scenes above depict the reaction at four different times, out of sequence, as it reaches equilibrium. Each sphere (Y is red and Z is green) represents 0.025 mol, and the volume is 0.40 L. (a) Which scene(s) represent(s) equilibrium? A B (b) List the scenes in the correct sequence. If they are equal put them in alphabetical order. First: Second: Third: Fourth: A B A B D A B C D A B C D U Y=2Z

For a reaction A+B 2 AB, if the initial concentration of A is 2.00 M, B is 1.80 M and AB is OM and the equilibrium concentration of AB is 0.02 M. Select all statements that are TRUE. O The concentration of A at equilibrium is 2.00 M. O To calculate the Keg for this reaction, we can use (A]=2.00 M, [B]= 1.80 M and (AB]=0.02 M to solve for it. O The concentration of B at equilibrium is 1.78 M. O The Keq will be much larger than 1 and this reaction favor the formation of the product. O The change in concentration, x, is equal to 0.02 M.

Consider the following graphical representation of concentration versus time for the equilibrium system: COC1₂(g) = Cl₂(g) + CO(g) AH = + 108 kJ 0.14 0.12- -C1₂ 0.10- CO 0.08 0.06- COCI₂ 0.04 0.02- 0.00 0 2 8 10 16 Time (min) a) What change was imposed at time = 4 minutes? Be specific. b) What change was imposed at time = 10 minutes? Be specific. c) What change was imposed at time = 14 minutes? Be specific. d) Using the data for the 12 minute mark, calculate the value of Keq at the temperature concerned. Show your work. Concentration (mol L-¹) 12 18

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