Chemistry Practice Problems Reaction Mechanism Practice Problems Solution: Consider the reaction mechanism NO2(g) + Cl2(g) → ...

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Solution: Consider the reaction mechanism NO2(g) + Cl2(g) → ClNO2(g) + Cl(g)     SlowNO2(g) + Cl → ClNO2(g)                       FastWhat is the predicted rate law for this mechanism?a) Rate = k[NO2][Cl2][Cl]b) Rate = k[NO2][Cl]c) Rate = k[NO2]2[Cl2]d) Rate = k[NO2][Cl2]e) Rate = k[NO2]2[Cl2][Cl]−1

Problem

Consider the reaction mechanism 

NO2(g) + Cl2(g) → ClNO2(g) + Cl(g)     Slow

NO2(g) + Cl → ClNO2(g)                       Fast

What is the predicted rate law for this mechanism?

a) Rate = k[NO2][Cl2][Cl]

b) Rate = k[NO2][Cl]

c) Rate = k[NO2]2[Cl2]

d) Rate = k[NO2][Cl2]

e) Rate = k[NO2]2[Cl2][Cl]−1

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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