## Third Order Reactions

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

Maggie Elgin 2A
Posts: 19
Joined: Wed Sep 21, 2016 2:57 pm

### Third Order Reactions

I know that third reactions are extremely uncommon but what would be example of a real life third order reaction?

Sydmon Nguyen-Tran 1N
Posts: 21
Joined: Wed Sep 21, 2016 2:59 pm

### Re: Third Order Reactions

The hydrolysis of sucrose in acid solution is third-order, r = k[sucrose][H+][H2O]; however, the concentrations of both the catalyst H+ and the solvent H2O are normally constant, so that the reaction is pseudo–first-order.

Jimmy Zhou 3D
Posts: 30
Joined: Sat Jul 09, 2016 3:00 am

### Re: Third Order Reactions

The rate constant for a third order reaction would also be M-2 s-1 if time was given in seconds.

Jimmy Zhou 3D
Posts: 30
Joined: Sat Jul 09, 2016 3:00 am

### Re: Third Order Reactions

also if you had a reaction with A+B+C -> products

that could be a third order reaction.

Natassia Dunn 3G
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Joined: Wed Sep 21, 2016 2:59 pm

### Re: Third Order Reactions

What would be the integrated rate law for a third order reaction?

nathansalce 3e
Posts: 52
Joined: Thu Jul 27, 2017 3:01 am

### Re: Third Order Reactions

The general example of a third order reaction is one where 3 molecules must collide, making it unlikely to occur as this is an unlikely event.