Rate of Reaction Video Lessons

Concept:

# Problem: The mechanism for the oxidation of HBr by O2 to form 2 H2 O and Br2 is shown below.4HBr(g)+O2(g)2H2O(g)+2Br2(g)HBr(g)+O2(g)HOOBr(g) HOOBr(g)+HBr(g)2HOBr(g)HOBr(g)+HBr(g)H2O(g)+Br2(g).HBr does not react with O2 at a measurable rate at room temperature under ordinary conditions. What can you infer from this about the magnitude of the activation energy for the rate-determining step?

###### FREE Expert Solution

We're asked to state what we can infer about the magnitude of the activation energy for the rate-determining step based on the given mechanism for the oxidation of HBr by O2 to form 2 H2O and Br2

We also know that HBr does not react with O2 at a measurable rate at room temperature under ordinary conditions.

Recall that the higher the activation energy, the slower the rate of a reaction

The overall reaction mechanism is: 4HBr(g)+O2(g)  2H2O(g)+2Br2(g)

The individual steps are:

(1) HBr(g)+O2(g)HOOBr(g)

(2) HOOBr(g)+HBr(g)2HOBr(g)

(3) HOBr(g)+HBr(g)H2O(g)+Br2(g)

79% (140 ratings)
###### Problem Details

The mechanism for the oxidation of HBr by O2 to form 2 H2 O and Bris shown below.

4HBr(g)+O2(g)2H2O(g)+2Br2(g)

HBr(g)+O2(g)HOOBr(g)
HOOBr(g)+HBr(g)2HOBr(g)
HOBr(g)+HBr(g)H2O(g)+Br2(g).

HBr does not react with O2 at a measurable rate at room temperature under ordinary conditions. What can you infer from this about the magnitude of the activation energy for the rate-determining step?