page 11 21. Consider the reaction pathway shown below. ΔH = b ΔH = c ΔH = d ΔH = a Y Z W X According to Hess’s Law A b = a - c - d B b = a + c + d C b = d - c + a D b = d + c - a. 22. Which of the following is not a factor that affects the rate of a reaction? A Activation energy B Kinetic energies of reactant molecules C Concentration of reactants D Enthalpy change of reaction 23. In which of the following reactions would the yield of product be increased by lowering the pressure? A H2(g) + I2(g) ∏ 2HI(g) B N2(g) + 3H2(g) ∏ 2NH3(g) C N2O4(g) ∏ 2NO2(g) D CO(g) + 2H2(g) ∏ CH3OH(g) [Turn over