The 5 questions below (a. to e.) are related to the following graph.

The graph below shows the concentrations of the reactants and products for a endothermic reaction under reversible conditions where the reactants and products are all gases.

1. Given the variations of concentration over time depicted in the graph and table above, determine the stoichiometric coefficients for the reversible reaction
   (enter the stoichiometric coefficients as numbers, e.g. if you think the balancing number should be 1 then type "1") [1 mark]
   A (g)  ⇌  B (g)

2. If, at a certain time, the value of the equilibrium constant, K, was 6.67. What would the value of the equilibrium constant be if all the stoichiometric coefficients for the reaction were halved?  [1 mark]
   (give your answer to 3 significant figures):  

3. At each of the times labelled "Time(1)" and "Time(2)" a disturbance was made to the reaction mixture.

   1. Determine what disturbance was made at "Time(1)" [0.5 marks]
      Reactant A was removed from the reaction mixture

      The volume of the reaction mixture was decreased/the pressure of the reaction mixture was increased

      A catalyst was added to the system

      The temperature of the reaction mixture was increased

      Product B was added to the reaction mixture

      Product B was removed from the reaction mixture

      The temperature of the reaction mixture was decreased

      Reactant A was added to the reaction mixture

      The volume of the reaction mixture was increased/the pressure of the reaction mixture was decreased

   2. Determine what disturbance was made at "Time(2)" [0.5 marks]
      The volume of the reaction mixture was increased/the pressure of the reaction mixture was decreased

      The volume of the reaction mixture was decreased/the pressure of the reaction mixture was increased

      The temperature of the reaction mixture was decreased

      The temperature of the reaction mixture was increased

      A catalyst was added to the system

      Product B was removed from the reaction mixture

      Product B was added to the reaction mixture

      Reactant A was added to the reaction mixture

      Reactant A was removed from the reaction mixture

4. How will the value of the equilibrium constant at 10 minutes (K_{10 min}) compare to the value of the equilibrium constant at 6 minutes (K_6 min)?  [1 mark]
   The equilibrium constant at 10 minutes will be
   equal to

   less than

   greater than
   the equilibrium constant at 6 minutes

5. The enthalpy change, Δ_rH, for the forward reaction is +52 kJ mol^-1. The temperature of the system at 10 minutes was 298 K. What was the temperature of the system at 6 minutes?  [1 mark]
   (give your answer to 3 significant figures and in units of K, do not type the units in the answer box):  K