A problem for help!

[sunnye]

what does it mean to have a fractional order of reaction. like [H2]]1/2, does this means 1/2 moles of bromine is reacting with one mole of hydrogen?

Edited July 21, 2008 by Phi for All
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[CaptainPanic]

[math] reaction rate = constant * [H2][br2]^{1/2} [/math]

 

It means that you take the concentration of H2, multiply it by the square root of the concentration of Br2, and (optionally, but commonly) multiply it by a constant.

 

The reaction is (probably):

[ce]H2 + Br2 --> 2 HBr [/ce]

So, you can see that 1 mole of H2 react with 1 mole of Br2, to form 2 moles of HBr.

 

p.s. if you just have a question, you can just ask... no need to post other things (like about rubber or Kr)... some people ask, some give answers... but it's not a market where you must sell something before you can buy something

[John Cuthber]

Reaction orders are just what you measure. They are not under any obligation to be nice simple numbers.

The molecularity of a reaction is another matter, a bimolecular reaction really must involve the reaction of two molecules.