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Question 10 1 pts The graphs show potential energy diagrams for the same reaction at T-900. K R P 1) uncatalysed process; 2) catalysed reaction Uncatalyzed Reaction 400 300 reactants 200 100 products Reaction coordinate Uncatalysed reaction: Potential Energy (P.E.) vs reaction coordinate. Energy is measured from O to 400. kJ, and the reaction coordinate is associated with the evolution of the reaction. The PE of the reactants is 225 kJ. Then the energy grows to 400. kJ, reaching its maximum value, and then falls to 100. kJ (PE of the products) Catalyzed Reaction 400 300 reactants 200 ential energy (KJ) Potential energy (kJ) Catalyzed Reaction 400 300 reactants 200 100 products Reaction coordinate Catalysed reaction: The potential energy of the reactants is 225 kJ (same reaction), then the energy increases to 270. kJ reaching the first peak, then lowers to 210. kJ. As the reaction continues, PE increases again, reaching its second peak at 280. kJ, and finally falls to 100. kJ. How does the presence of a catalyst affect the activation energy of a reaction? A catalyst decreases the activa According to the PE diagrams, and information above: By what factor does the catalyst increase the rate constant of the reaction at T=900. K? [Select] pm_9120 Potential energy (kJ) Question 8 1 pts At 473 K, for the elementary reactiion: 2 NOCI(g) 2 NO(g) +Cl2(g) k1) 7.8x102 L/mol*s k-1) 4.7x102 L2/mol2's A sample of NOCI(g) is placed in a completely empty container and then heated to 473 K, when the decomposition reaction kicks in. When the system reaches equilibrium, [NOCI} is found to be 0.12 mol/L Use your knowledge of kinetics to determine the concentrations of each of the species when equilibrium is reached at 473K: 0.0884 C12 0.0171 M NO ma 0219

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- 55/RT e 1=-ء ا 129/RT مد 120x103 314 کx90 K 92 2.2957-S4 ٠2/٥ )١ تء|ثم تاي تا

mals hare k We 2 4.7 XI0 2- 4.710 Ken ト054×10 Now 2NO 2 NOC 2 Lonentraten nitialy a Conentratien 2ル a at ea - KrCon Cro (27) (a-2222 Given (a-2x) CNOJ012 m/L

3 4 x Kea 0-122 1 oS4 XIO 6 4 -7 3.79 x10 3. 79 x10-7 -3 子-24 ×10 448×o 2x 子-24x(0 and CNOJ mo