Chemistry Practice Problems Reaction Mechanism Practice Problems Solution: #1 Consider the following mechanism:Step 1: 2A → B...

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Solution: #1 Consider the following mechanism:Step 1: 2A → B slowStep 2: B + C → D fastOverall 2A + C → DDetermine the rate law for the overall reaction (where the overall rate constant is represented as k). #2 Consider the following mechanism:Step 1: 2A ⇌ B equilibriumStep 2: B + C → D slowOverall: 2A + C → DDetermine the rate law for the overall reaction (where the rate constant is represented as k)

Problem

#1 Consider the following mechanism:

Step 1: 2A → B slow

Step 2: B + C → D fast

Overall 2A + C → D

Determine the rate law for the overall reaction (where the overall rate constant is represented as k). 

#2 Consider the following mechanism:

Step 1: 2A ⇌ B equilibrium

Step 2: B + C → D slow

Overall: 2A + C → D

Determine the rate law for the overall reaction (where the rate constant is represented as k)

Solution

When a reaction mechanism is given, the rate law can be determined using the slow step in the reaction mechanism.

 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:

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