I\'m having a hard time with this problem: Suppose the system 2X(g) + Y(g) <----

Question

I'm having a hard time with this problem:

Suppose the system

2X(g) + Y(g) <----- Z
                   ----->
is at equilibrium and the concentration of X is 0.60 M. SufficientX is not added to raise its concentration temporarily to 1.0 M.Which of the following would most likely represent theconcentration of X when equilibrium has been reestablished?
0.60 M
0.80 M
0.04 M
1.20 M
1.00 M

Could some help and explain please? I feel like its 1.20 M or 1.00M but I'm not sure.. Responses are much appreciated!

Explanation / Answer

Suppose the system 2X(g) + Y(g) is at equilibrium and the concentration of X is 0.60 M. SufficientX is not added to raise its concentrationtemporarily to 1.0 M. Which of the following would most likelyrepresent the concentration of X when equilibrium has beenreestablished? 0.60 M 0.80 M 0.04 M 1.20 M 1.00 M Could some help and explain please? I feel like its 1.20 M or 1.00M but I'm not sure.. Responses are much appreciated! Is that not or now? At equilibrium you have 0.60 M of X. You raised theconcentration of X, so X must react to form more product Z K = [X]^2[Y]/[Z]. If X increases, the equilibrium can only be reestablished if Y andX decrease (they react) and form Z, the value in thedenominator. The answer is B). The value must be less than 1. But the valuecan't be 0.6. By adding X, only some of the additional X reacts toform Z. So 0.8M is your answer. Mathematically, if X = 0.6 again, Ywill be too small and Z will be too large relative to the 1stequilibrium

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