## Units

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

Daniel Yu 1E
Posts: 100
Joined: Sat Aug 24, 2019 12:15 am

### Units

What are the units for k in a zero order reaction? What are the units for the reactants of a zero order reaction? I don't understand why the units are what they are can someone help me?

Jacey Yang 1F
Posts: 101
Joined: Fri Aug 09, 2019 12:17 am

### Re: Units

The units for k in a zero order reaction is M/s.

Indy Bui 1l
Posts: 99
Joined: Sat Sep 07, 2019 12:19 am

### Re: Units

This helped me, hope it helps you too. https://users.stlcc.edu/gkrishnan/rateunits.htm

Julie Park 1G
Posts: 100
Joined: Thu Jul 25, 2019 12:15 am

### Re: Units

Rate is generally described as $\frac{mol}{L\cdot s}$
The zeroth order is described by $k_{0}[A]^0=k_0$ and since $[A]^0=1$, the units remain as $\frac{mol}{L\cdot s}$

This video helps with finding the units for any-order reactions
Last edited by Julie Park 1G on Sat Mar 14, 2020 8:29 pm, edited 1 time in total.

Daria MacAuslan 1H
Posts: 50
Joined: Sat Aug 17, 2019 12:16 am

### Re: Units

I think the units for a zero order reaction are molarity per second (or M/second). In a zero order reaction, the reactant is just pretty much colliding with the walls of the space it is within, not with any other reactant.

Oduwole 1E
Posts: 100
Joined: Fri Aug 02, 2019 12:16 am

### Re: Units

Daniel Yu 1E wrote:What are the units for k in a zero order reaction? What are the units for the reactants of a zero order reaction? I don't understand why the units are what they are can someone help me?

For a zero order reaction it would be M/s

Aarushi Solanki 4F
Posts: 107
Joined: Sat Jul 20, 2019 12:17 am

### Re: Units

The units for a zeroth order reaction is M/s, or mol/(L*s).

Brandon Tao 1K
Posts: 100
Joined: Sat Aug 17, 2019 12:15 am

### Re: Units

Units for K in a zero order reaction is m/s

SVajragiri_1C
Posts: 115
Joined: Thu Jul 11, 2019 12:16 am

### Re: Units

For a zero order reaction, the units for k is M/s. The general formula for units of k based on the order, where p is the order of the reaction, is M^(1-P)/s.

Jacob Villar 2C
Posts: 105
Joined: Sat Aug 17, 2019 12:18 am

### Re: Units

Zero order reaction units are in M/s.