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Help calculating rate constant from graph?

http://i.imgur.com/TwxkmSAh.jpg
http://i.imgur.com/hnovhowh.jpg

It's B(ii) not sure what I did wrong and what I was meant to do, forgot to ask teacher as well.
Would appreciate any help.
Original post by WilliamSlim
http://i.imgur.com/TwxkmSAh.jpg
http://i.imgur.com/hnovhowh.jpg

It's B(ii) not sure what I did wrong and what I was meant to do, forgot to ask teacher as well.
Would appreciate any help.


You have calculated the rate when the concentration is 3.0 ...

... but you have not used this value in your calculation.

Rate = k[A]

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