In the chemical reaction where N2O4(g) is converted to 2NO2(g), if 0.5 M N2O4 and 0.15 M NO2 are present in the vessel, is the reaction at equilibrium? If not, which direction would the reaction proceed? (Kc = 4.4 × 10^-3) N2O4(g) 2NO2(g)

A. No, Q = 0.18 so the reaction should proceed in the forward direction.
B. No, Q = 9.0 × 10^-2 so the reaction should proceed in the reverse direction.
C. Yes, the reaction is at equilibrium.
D. No, Q = 4.5 ×10^-2 so the reaction should proceed in the reverse direction.

Question

In the chemical reaction where N2O4(g) is converted to 2NO2(g), if 0.5 M N2O4 and 0.15 M NO2 are present in the vessel, is the reaction at equilibrium? If not, which direction would the reaction proceed? (Kc = 4.4 × 10^-3) N2O4(g) 2NO2(g)

 		A.	No, Q = 0.18 so the reaction should proceed in the forward direction.
 		B.	No, Q = 9.0 × 10^-2 so the reaction should proceed in the reverse direction.
 		C.	Yes, the reaction is at equilibrium.
 		D.	No, Q = 4.5 ×10^-2 so the reaction should proceed in the reverse direction.

vera_ewing · Answer

@JoannaBlackwelder A or B?

abb0t · Answer

Why don't you focus more on trying to answer this question yourself instead of trying to establish a singing contest in the math chat. 
There are books which can help you with this:

joannablackwelder · Answer

How did you come down to A or B?

joannablackwelder · Answer

Take a look: http://chemwiki.ucdavis.edu/Physical_Chemistry/Equilibria/Chemical_Equilibria/The_Reaction_Quotient/Difference_Between_K_And_Q

vera_ewing · Answer

Okay, thanks so much!

joannablackwelder · Answer

You're welcome :-) Let me know what equation or value you get for Q.