What is the rate law for the following mechanism in terms of the overall rate constant k?
Step 1: A + B ↔ C (fast)
Step 2: B + C → D (slow)
We’re asked to determine the overall rate constant K for the given two steps mechanism.
When a reaction mechanism is given, the rate law will depend on reactants and products in the slow step.
▪Rate law only involves the reactants
▪ The coefficients of the reactants in the slow step are the order of the reaction with respect to that reactant
▪ Rate Law has a general form of:
k = rate constant
X & Y = reactants
a & b = reactant orders
▪ The equilibrium constant has a general form of: