## First Order Equation

$\frac{d[R]}{dt}=-k[R]; \ln [R]=-kt + \ln [R]_{0}; t_{\frac{1}{2}}=\frac{0.693}{k}$

Eunice Lee 1A
Posts: 60
Joined: Wed Oct 03, 2018 12:16 am

### First Order Equation

How is ln[R]=-kt+ln[R]0 useful? What does it tell us?

Chem_Mod
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### Re: First Order Equation

This is the integrated rate law for a first order reaction. The integrated rate laws tell you how much concentration of something you have left after some time has passed.

Posts: 57
Joined: Fri Sep 28, 2018 12:27 am

### Re: First Order Equation

this equation is the integrated rate law for first order reactions and to add to what the previous post said, you are able to graph this as just a downward straight line, because of the -k (slope) and the y intercept, ln [A]0

Claudia Luong 4K
Posts: 59
Joined: Fri Sep 28, 2018 12:25 am

### Re: First Order Equation

We can also use this equation to solve for initial concentrations or rate constant if needed.