A 0.10 mol sample of each of the four species in the reaction represented above is injected into a rigid, previously evacuated 1.0 L container. Which of the following species will have the highest concentration when the system reaches equilibrium?

a. H2S(g)
b. CH4(g)
c. CS2(g)
d. H2(g)

The question is incomplete. complete question is;

A 0.10 mol sample of each of the four species in the reaction represented above is injected into a rigid, previously evacuated 1.0 L container. Which of the following species will have the highest concentration when the system reaches equilibrium?

a.

b.

c.

d.

The correct answer is option a.

Explanation:

The equilibrium constant of the reaction=

Concentration of the species initially:

The equilibrium quotient of the reaction is :

(reaction will go backward)

Initially

0.10 M    0.10 M    0.10 M    0.10 M

At Equilibrium :

(0.10+2x) M    (0.10+x) M    (0.10-x) M    (0.10-4x) M

Solving formx:

x = 0.099 M

As we can see that from the reaction at equilibrium, the concentration of hydrogen sulfide will be highest:

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