Question

What is the reaction quotient Qc for the following equilibrium reaction at 25°C, given the molar concentrations of the reactants and products:2NO2(g) ⇌ 2NO(g) + O2(g)[NO] = 0.50 M, [O2] = 0.25 M, and [NO2] = 0.75 M.

Answer 1

The reaction quotient Qc is calculated using the molar concentrations of the reactants and products raised to the power of their stoichiometric coefficients. For the given reaction:2NO2 g   2NO g  + O2 g The expression for Qc is:Qc =  [NO]^2 * [O2]  / [NO2]^2Given the molar concentrations: [NO] = 0.50 M, [O2] = 0.25 M, and [NO2] = 0.75 M, we can plug these values into the Qc expression:Qc =   0.50 ^2 *  0.25   /  0.75 ^2Qc =  0.25 * 0.25  / 0.5625Qc = 0.0625 / 0.5625Qc  0.111So, the reaction quotient Qc for the given equilibrium reaction at 25C is approximately 0.111.