Question

Calculate the reaction quotient (Qc) for the chemical equation:2NO(g) + O2(g) ⇌ 2NO2(g)At a certain reaction conditions, the concentrations of NO, O2, and NO2 are 0.45 M, 0.25 M, and 0.60 M respectively. Determine if the reaction is at equilibrium and, if not, in which direction will it proceed to reach equilibrium.

Answer 1

To calculate the reaction quotient  Qc , we use the expression:Qc = [NO2]^2 /  [NO]^2 * [O2] where [NO2], [NO], and [O2] are the concentrations of NO2, NO, and O2, respectively.Given the concentrations of NO, O2, and NO2 are 0.45 M, 0.25 M, and 0.60 M respectively, we can plug these values into the Qc expression:Qc =  0.60 ^2 /   0.45 ^2 *  0.25  Qc = 0.36 /  0.2025 * 0.25 Qc = 0.36 / 0.050625Qc  7.11Now, we need to compare Qc to the equilibrium constant  Kc  to determine if the reaction is at equilibrium or not. If Qc = Kc, the reaction is at equilibrium. If Qc > Kc, the reaction will proceed in the reverse direction  left  to reach equilibrium. If Qc < Kc, the reaction will proceed in the forward direction  right  to reach equilibrium.However, the value of Kc is not provided in the problem. To determine if the reaction is at equilibrium and in which direction it will proceed, we need the value of Kc.