Consider the reversible reaction: A(g) 2B(g) At equilibrium, the concentration o
ID: 998653 • Letter: C
Question
Consider the reversible reaction: A(g) 2B(g) At equilibrium, the concentration of A is 0.381 M and that of B is 0.154 M. What is the value of the equilibrium constant, K_eq? 0.0622 0.404 1.06 2.47 16.1 Which one of the following, if changed, would change the value of the equilibrium constant, K_eq, of a reaction? Concentration of reactants concentration of the products temperature catalyst size of reaction vessel The reaction shown below is at equilibrium. Use Le Chatelier's principle to predict the effect of adding ammonia gas to the equilibrium reaction mixture N_2(g) + 3 H_2(g) 2NH_2 (g) The equilibrium post lion will remain unchanged The equilibrium position will shift to the right The equilibrium position will shift to the left. The equilibrium constant will increase. All of the nitrogen gas w ill be used up. A reaction will be spontaneous at all temperatures under which conditions? The reaction is endothermic and accompanied by an increase of disorder. The reaction is endothermic and accompanied by a decrease in disorder The reaction is exothermic and accompanied by an increase in disorder. The reaction is exothermic and accompanied by a decrease in disorder The reaction has a positive value for free energy change. Which of the following represents an exothermic reaction? Which of the following is a process with a negative Delta S? H_2O (l) rightarrow H_2 (g) CO_2(s) rightarrow CO_2(g) CaCO_3(s) rightarrow CaO(s) + CO_2 (g) dissolving sugar in water None of the choices are correct; Delta S cannot be negative.Explanation / Answer
15)A(g)<à2B
Keq=[B]^2/[A]=(0.154M)^2/0.381M=0.0622
16)E)size of reaction vessel or volume
Keq=[product]^m/[reactant ]^n=[moles of product/V]^m/[moles of reactants/V]^n= (moles of product)^m/(moles of reactant)^n *(1/V)^m /(1/V)^n== (moles of product)^m/(moles of reactant)^n *(V)^n-m
k’eq=(moles of product)^m/(moles of reactant)^n *(V’)^n-m where V’ is changed volume
Keq is not equal to k’eq for n unequal to m.
17)C) the equilibrium will shift to the left (towards the reactant side ) to balance for increase in product concentration and re-establish its equilibrium
18)C)
When a reaction is exothermic it has –ve value of H and for increase of disorder S,entropy is positive.so G,gibbs free energy is negative ,hence the reaction is spontaneous
G=H-TS
19)B) heat is released as a by-product
20)A)
Liquid is changing its phase to less disordered or more compact form solid so its degree of disorderliness or entropy is decreasing