### Help with question 11.7

Posted:

**Wed Jan 09, 2019 9:42 pm**11.7 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.

I really need help with c. I dont get why the mole fraction formula gives you the correct answers? Can someone please explain.

Thanks

(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.

I really need help with c. I dont get why the mole fraction formula gives you the correct answers? Can someone please explain.

Thanks