How To Determine The Units Of The Rate Constant K - Chemical Kinetics | Summary and Q&A

163.0K views
November 20, 2017
by
The Organic Chemistry Tutor
YouTube video player
How To Determine The Units Of The Rate Constant K - Chemical Kinetics

TL;DR

This lesson explains how to calculate the units of the rate constant (k) for different order reactions.

Install to Summarize YouTube Videos and Get Transcripts

Questions & Answers

Q: How do you calculate the units of k for a zero-order reaction?

In a zero-order reaction, where rate = k, the units of k are molarity per second (mol/L/s).

Q: What are the units of k for a first-order reaction with respect to a and overall?

In a first-order reaction with respect to a and overall, the units of k depend on the given time unit. For example, if the rate is given as mol/L/min, then the units of k are minutes to the negative 1 power (1/min).

Q: How do you determine the units of k for a second-order overall reaction?

In a second-order overall reaction, the units of k can be calculated using the formula. For example, if the rate is given as molarity per hour (mol/L/h), then the units of k are liters per mole per hour (L/mol/h).

Q: Is there an alternative method to calculate the units of k without using the formula?

Yes, you can isolate k in the rate law expression, divide both sides by the concentrations, and replace them with their units to determine the units of k. This method can provide the same result as using the formula.

Summary & Key Takeaways

  • For a zero-order reaction, the units of k can be calculated as molarity per second (mol/L/s).

  • In a first-order reaction, the units of k depend on the time unit given (e.g., minutes or hours).

  • For a second-order overall reaction, the units of k are liters per mole per hour (L/mol/h).

Share This Summary 📚

Summarize YouTube Videos and Get Video Transcripts with 1-Click

Download browser extensions on:

Explore More Summaries from The Organic Chemistry Tutor 📚

Summarize YouTube Videos and Get Video Transcripts with 1-Click

Download browser extensions on: