The following flasks show the dissociation of a diatomic molecule, X2, over time. (a) Which flask represents the point in time at which the reaction has reached equilibrium?(b) What percentage of the X2 molecules have decomposed at equilibrium? (c) Assuming that the initial pressure of X2 was 0.10 bar, calculate the value of K for the decomposition.
For this question I'm confused for how do we tell which flask is the one that has reached equilibrium. Both the 3rd and the 4th flask have 5 moles of X2 and 12 moles of X.
Then for part b I understand that that the idea value of equilbrium would be 6 moles of X2 for every 12 moles of X but since the answer says that flask three is at equilibrium shouldn't the percentage of X2 decomposed at equilibrium 5/11 instead of 6/11.
For part C why can we not do an ICE table ?
Thanks so much.