Hello, i dont get this particular problem, i will award points if someone can en

Question

Hello, i dont get this particular problem, i will award points if someone can enlighten me on how to do this with detailed steps

Consider the reaction: A2(g) + X2(g) 2AX(g). Let a square represent an atom of A and a circle represent an atom of X. The value for the equilibrium constant for this reaction at 25 degree C is greater than 1. The drawing below labeled Before shows a small representative volume of a container held at 25 degree C immediately after A2 and X2 have been added but before reaction between A2 and X2 to give AX has occurred. Circle the letter of each choice below that would be a possible drawing of the same small representative volume after equilibrium has been attained in the system described by the chemical equation above. For each incorrect choice, state why it is incorrect; be as specific as possible.

Explanation / Answer

The answer is: C and E


A2(g) + X2(g) <=> 2 AX(g)

Equilibrium constant Kc = [AX]^2/[A2][X2]


Since concentration = moles/volume and volume terms cancel out:

Kc = (number of AX)^2/(number of A2 x number of X2)


From question: Kc is greater than 1

Also there must be material balance

=> total number of A2 + X2 + AX molecules before and after reaction = 8


(A) Number: AX = 0, A2 = 3, X2 = 5

Incorrect as Kc = 0^2/(3 x 5) = 0 is less than 1


(B) Number: AX = 2, A2 = 1, X2 = 1

Incorrect as total number of A2 + X2 + AX molecules after reaction = 2 + 1 + 1 = 4 not equal to 8


(C) Number: AX = 6, A2 = 0, X2 = 2

Correct as Kc = 6^2/(0 x 2) = infinite is greater than 1


(D) Number: AX = 2, A2 = 2, X2 = 4

Incorrect as Kc = 2^2/(2 x 4) = 0.5 is less than 1


(E) Number: AX = 4, A2 = 1, X2 = 3

Correct as Kc = 4^2/(1 x 3) = 5.3 is greater than 1


(F) Incorrect as C and E are correct

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