22) The equilibrium constant for the gas phase reaction N2 (g) + O2 (g) 2NO (g)

Question

22) The equilibrium constant for the gas phase reaction N2 (g) + O2 (g) 2NO (g) is Keq-4.20 x 10-31 at 30°C. At equilibrium, A) products predominate 8) reactants predominate C) roughly equal amounts of products and reactants are present D) only products are present E) only reactants are present 23) How is the reaction quotient used to determine whether a system is at equilibrium? A) The reaction quotient must be satisfied for equilibrium to be achieved. B) At equilibrium, the reaction quotient is undefined C) The reaction is at equilibrium when Q Keq E) The reaction is at equilibrium when Q- Keq 24) Of the following equilibria, onlywill shift to the right in response to a decrease in volume. A) H2 (g) + Cl2 (g) 2 HCI (g) 2 SO2 (g) + O2 (g) + B) 2 SO3 (g) c) N2 (g) + 3 H2 (g) 2 NH3 (g) D) 2 Fe203 (s) -+ 4 Fe (s) + 302 (g) E) 2HI (g) + H2 (g) + 12 (g) 25) The reaction below is exothermic: 2SO3 (g) 2502 (g) + O2 (g) Le Chatelier's Principle predicts that__, will result in an increase in the number of moles of SO3 (g) i the reaction container. A) increasing the pressure B) decreasing the pressure C) increasing the temperature D) removing some oxygen ) increasing the volume of the container

Explanation / Answer

22) At equilibrium, the amounts of reactants and products are approximately equal.

The answer will be C.

23) At equilibrium, the reaction quotient Q is equal to the equilibrium constant Kc .

Q= [NO]2/[N2][O2]

So if Q is equal to the given value of Kc then the reaction is at equilibrium.

If Q>Kc then the reaction will proceed in the direction of reactants.(In the backward direction)

If Q<Kc then the reaction will proceed in the direction of products.(In the forward direction)

24) If we decrease the volume then equilibrium will shift in the direction of a lesser number of moles of gas.

If we increase the volume then equilibrium will shift in the direction of more number of moles of gas.

However, there will be no change in the direction if the number of moles of gases is equal.

According to this:

A) Product side, np =2 and reactant side nr=2; There will be no shift in equilibrium.

B) np=3 ,nr=2.The equilibrium shifts towards Reactant side(Bacward).

C) np=2 ,nr=4.The equilibrium shifts towards Product side(Forward).

D) np =7, nr =2.The equilibrium shifts towards Reactant side(Bacward).

E) np=2,nr=2.There will be no shift in the equilibrium.

25) According to the Le Chatelier's Principle, if we increase the pressure then to counteract the change the equilibrium will shift towards the less number of moles of the gas. Here we have np=2 and nr =3.

Hence the result will be an increase in the number of moles of SO3(g) will be caused by increasing the pressure.

Option A.

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