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Reaction kinectics Problem

Can someone pls explain how to solve 2(b) ? I saw the markscheme and still couldn't figure how they solved it. I mean how does the order of reaction of individual compounds differ with the rate of reaction of a step in the reaction being slow or fast...





2 b.gif
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Pigster
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If X appears once in the equation for the reaction occurring in the slowest step, it is first order WRT X.

If X appears twice... 2nd order.

If X isn't in the slow step it is zero order.
Original post by Askeladd
Can someone pls explain how to solve 2(b) ? I saw the markscheme and still couldn't figure how they solved it. I mean how does the order of reaction of individual compounds differ with the rate of reaction of a step in the reaction being slow or fast...





2 b.gif


To add to Pigster's post, you also need to consider the components of any reaction preceeding the RDS which form intermediates needed for the RDS.

For example, if the RDS is the second step and it has a species which does not appear in the stoichiometric equation but which is made in the first step then the reactants of the first step must also appear in the rate equation.

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