The equilibrium constant, kp, equals 3.40 at 25°c for the isomerization reaction: cis-2-butene ⇌ trans-2-butene. if a flask initially contains 1.00 atm of each gas, in what direction will the system shift to reach equilibrium?

The reaction will proceed to the right (favoring the products).

Explanation:

Let's consider the following isomerization reaction.

cis-2-butene ⇌ trans-2-butene

To predict in what direction will shift to reach equilibrium, we have to calculate the reaction quotient (Qp).

Since Qp (1.00) < Kp (3.40), the reaction will proceed to the right, so that the pressure of the product increases, the pressure of the reactant decreases, and Qp reaches the value of Kp.

it is the most commonly accepted one