chemistry (equilibrium)

Question

At a certain temperature, Ke = 3 for the reaction

NO3(g) NO(g) + O2(g)

Find the direction of the reaction if at some point in time in a 1.0 vessel the following respective concentrations were measured; [NO] = 2.0 mol/L, [O2] = 1.0 mol/L and NO3(g) = 0.75 mol/L

Answer 1

We want to solve for Q (reaction quotient) and then compare this value to the Keq.

NO3(g) ==> NO(g) + O2(g)

Q = [NO][O2] / [NO3]

Q = (2.0)(1.0) / (0.75)

Q = 2.67

Since Q is LESS THAN Keq, the reaction has not yet reached equilibrium. So, the direction of the reaction at this point in time will be TO THE RIGHT, TOWARDS THE PRODUCTS