1. Which of the following is true about chemical equilibrium? a) b) c) d) e) Iti

Question

1. Which of the following is true about chemical equilibrium? a) b) c) d) e) Itis microscopically and macroscopically static. Itis microscopically and macroscopically dynamic. Itis microscopically static and macroscopically dynamic. It is microscopically dynamic and macroscopically static. None of these are true about chemical equilibrium. 2. For the reaction given below, 2.00 moles of A and 3.00 moles of B are placed in a 6.00-L container A(g)+2B(g)C(g) At equilibrium, the concentration of A is 0.282 molL. What is the concentration of B at equilibrium? a) 0.282 molL b) 0.397 molL c) 0.500 molL d) 0.564 molL e) none of these 3. If, at a given temperature, the equilibrium constant for the reaction Hz(g) + Cl2(g 2HCl(g) is Kp, then the equilibrium constant for the reaction HCI(g)H2(g) + ½ Cl2 (g) can be represented as b) Kp' c) e) none of these

Explanation / Answer

1. Chemical equilibrium are,

c) macroscopically static and microscopically dynamic

2. initial concentration of,

[A] = 2 mol/6 L = 0.333 M

[B] = 3 mol/6 L = 0.5 M

For every molecule of A, 2 molecule of B are reacting

at equilibrium, [A] = 0.282 M

Change in concentration of [A] = 0.333 - 0.282 = 0.051 M

So equilibrium concentration of [B] = 0.5 - 2 x 0.051 = 0.398 M

Answer : b) 0.397 mol/L

3. The equilibrium constant for the reverse reaction for 1 mole of HCl going to 1/2H2 and 1/2Cl2 would be,

c) 1/sq.rt.(Kp)

4. Applying law of mass action, we get,

d) K = [NO2]^2.[Cl2]/[NO2Cl]^2

5. The equilibrium constant K value for reverse reaction would be,

b) 30

6. Chemical concentration of reactant as compared to equilibrium concdntration of product are,

a. They are much smaller

7. Kp for the given reaction can be written as,

b) K/(RT)

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