Question

What is the reaction quotient (Qc) of the chemical reaction 2H2 + O2 → 2H2O at a temperature of 25°C given that the initial concentration of H2 is 0.5M, initial concentration of O2 is 0.2M, and initial concentration of H2O is 0M?

Answer 1

The reaction quotient  Qc  is calculated using the formula:Qc = [products] / [reactants]For the given reaction, 2H2 + O2  2H2O, the formula for Qc will be:Qc =  [H2O]^2  /  [H2]^2 * [O2] Given the initial concentrations:[H2] = 0.5 M[O2] = 0.2 M[H2O] = 0 MSince the reaction has not yet occurred, the initial concentration of the product  H2O  is 0. Therefore, the reaction quotient Qc will be:Qc =  0^2  /  0.5^2 * 0.2  = 0So, the reaction quotient  Qc  at the initial state is 0.