Final answer:
To calculate the reaction quotient Ktrial (Q), you need the concentration values of both reactants and products in the reaction at a given point in time before equilibrium is reached. Q = (8.0 × 10-3)(3.0 × 10-3)^3 / (4.0 × 10-3)(4.0 × 10-3)^2.
Step-by-step explanation:
When calculating the reaction quotient, Ktrial (Q), which is also known as the reaction quotient, you need to insert the concentration values of the reactants and products at a given moment, before the reaction has reached equilibrium. For a generic reaction aA + bB → cC + dD, the reaction quotient Q is expressed as Q = ([C]^c[D]^d) / ([A]^a[B]^b), where [A], [B], [C], and [D] are the molar concentrations of the chemical species and a, b, c, and d are the stoichiometric coefficients from the balanced chemical equation.
For example, if you have the following equilibrium reaction:
The reaction quotient Q, would be calculated using the concentrations as follows:
- Q = [CO][H2]^3 / [CH2][H2O]^2
Inserting the concentrations provided:
[CH2] = 4.0 × 10-3 M
[H2O] = 4.0 × 10-3 M
[CO] = 8.0 × 10-3 M
[H2] = 3.0 × 10-3 M
Q would be calculated as:
Q = (8.0 × 10-3)(3.0 × 10-3)^3 / (4.0 × 10-3)(4.0 × 10-3)^2