5 9. Which step in a multi-step reaction is the rate determining step? a) The first step b) The last step c) The step with the lowest activation energy d) The step with the highest activation energy 3 10. 2 501) + O262 503() AH = -197.8 kJ The reaction above is an important step in the production of sulphuric acid. An increase in which of the following will increase the ratio of SO/S0w at equilibrium? a) Pressure only b) Temperature only c) Both temperature and pressure d) Neither pressure nor temperature 11. Reactants A and B are mixed, each at a concentration 0.80 mole per litre. They react slowly, producing C and D. A(aq) + B(aq) + Claq) + D(aq) When equilibrium is reached, the concentration of C is measured and found to be 0.60 mol/L. The value of the equilibrium constant for the reaction must be: a) 0.60 b) 0.75 c) 0.80 d) 1.77 e) 9.0 12. N2(e) + 3 H2(e) > 2 NH3(e) What is the equilibrium expression for the above reaction? a) K = (NH1 [N][H] b) K = 2[NH] [N] [H2] c) K = 2(NH) 3[N] [Ha] d) K = [NH 1? [N][H]