# Rate equations

#### Tinachem

Hi, I need some help with the rate equation in the attachment. I can see that [A] is first order but when I try to calculate it comes up as a decimal. Any ideas?

thanks

#### Attachments

• 24 KB Views: 3

#### DrPelezo

A is closer to 2nd order and B is 2nd order. Double concentration => 4x increase in rxn rate => 2nd order rxn.