MediumChemistryHigh School (11–12)Chemical Kinetics › Temperature, the Arrhenius Equation and Collision TheoryNumericalA-LevelAPIBNEET
For a reaction in solution, the collision factor is calculated as Z = 2.5 × 10¹¹ L mol⁻¹ s⁻¹…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
For a reaction in solution, the collision factor is calculated as . The measured pre-exponential factor is . Find the probability factor . One collision in how many has the right orientation?
Need a reminder? The key ideaShow
The share of molecules with enough energy is . The rate constant is , so . For the energy profile, , where is the barrier of the reverse reaction.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Plan. . We want , so .
Step 1. The factor. . The units cancel, so has none.
Step 2. One in how many. .
Check. is smaller than 1, as it must be. A value this small means the molecules are large and need to meet in a special way.
Answer: , so one collision in has the right orientation.
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