page 04 7. Which of the following statements is correct for a feasible reaction under standard conditions? A The standard free energy change is negative and the equilibrium favours products. B The standard free energy change is negative and the equilibrium favours reactants. C The standard free energy change is positive and the equilibrium favours products. D The standard free energy change is positive and the equilibrium favours reactants. 8. At 298 K, 1 2N2(g)  +  O2(g)  ↓  NO2(g) ΔG° = +51.8 kJ mol−1 N2(g)  +  2O2(g)  ↓  N2O4(g) ΔG° = +97.7 kJ mol−1 What is the free energy change ΔG°, in kJ mol−1, for the conversion of nitrogen dioxide to one mole of dinitrogen tetroxide? A −45.9 B −5.9 C +5.9 D +45.9 9. Which of the following processes is endothermic and has a positive ΔS value? A Carbon burning B Snowflakes forming C Ethoxyethane evaporating D Ammonia gas and hydrogen chloride gas forming solid ammonium chloride 10. The reaction X  +  2Y  ↓  Z has the rate equation shown below. rate = k[X][Y] Which of the following could represent the rate determining step? A X  +  Y  ↓  intermediate B Y  +  Y  ↓  intermediate C X  +  Y  ↓  Z D XY  +  Y  ↓  Z