Question

9) The reaction between ammonia and oxygen gas is an eqilibrium process, shown as an equation below. The reaction K = 2.2 x 105 at 25°C. 4 NH, 0 + 30,6 2N, 0 + 6H0+ heat Would this reaction be considered product-favored or reactant-favored at equilibrium? a) (1) b) Write out the equilibrium expression for this reaction: (3) c) Suppose some of the nitrogen gas was removed from the reaction after equilibrium is reached. Would this shift the reaction to the left, or to the right? (2) d) Suppose the equilibrium system was heated. How would this change the concentration of the oxygen gas? (2) Give the definition of the equilibrium point for a reversible reaction: (1) 10) Shown below is a reaction energy diagram. Answer the questions below using this diagram. Products NRG Reactants a) (1) Reaction Pathway Is this reaction exothermic or endothermic? Draw on the diagram how Activation Energy (E.) is measured. Draw on the diagram how the Enthalpy (AH) is measured. b) (2) c) (2) -6-

Answer 1

Solution = 2.261015 at epuilibsium. D.No.9: (a) The given equation is 4NH3 + 30₂ & 2N₂ & 640 & heat. Here equilibrium constant Keg which is greater than l. So, if the value of equilibrium constant is greater thand, then it tends to shift towards product side, and product is favoured Here, the reaction is considered to be product favoured. to the equilibrium expression for the above reaction is given by (W21² (H₂020 Keq (nimg]" (02)3 As we know that the concentration of MO is neglected, (N₂² kep (N1uz]"(0,73 (6) we have () + Acording to te-Chatelier's primeiple : (1) If amount of reactant is inevased, equilibrium shifts to the product side. (912 of amount of product is moreased, equilibrium shifta to the reactant side. Here, N2 is a product and if the amount of Ny is

decvensed, it teltimea indirectly increases the amount of shifts equilibrium in sight i.ly towards products. reactants in solution and hence the (d) According - the system to the le-Chatalier's principle : (in If exothermic resition is heated, the equilibrium shift towards reactant sible. Gil if endoturmie reaction is heated, the equilibrium shifts towards product side. The given reaction is an exothermic reaction. So, on heating the epouilibrium would shift towards the reactant side, and since O2 is a reactant , its concentration would imereave. (e) for a reversible reaction, epuilibrium panit point is defined point where the for extent of forward reaction is equal to that of the backward reaction. P.NO:10: La) In the given energy diagram, reactands is lower than the energy of products: This means a constant enessy required to for the reactants to get converted into products. Hence, the given reaction is an endothermic reaction al a the energy of i's

Anowers of (b) and (c) ave shown on the diagram below. Transition state. Products. 1 NRG AU Reactants Reaction Pathway. transition state and reactants. Activation energy (E) is the difference in enosgy of energy of Enthalpy (AH) is the difference between the energies of products and reactants :