A2 edexcel chemistry kinetics

Anyone knows how to do this q ??
Thank you!

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I am afraid we don't just provide answers to questions. You will have to post what you have done so far and then we can give you pointers as to where you are going wrong.

11a.Significance --> vn-vt is the volume of n2 evolved between time t and the end.

11b) i really have no idea what graph i should plot . sorry.

Well, you can either measure the progress of a reaction by measuring the loss of reactant, or the increase of product. In this case, you haven't been given the amount of reactant, but you have been given the amount of product at each time (Vt). They have also given you Vn - Vt which is a measure of how far short of the final volume of nitrogen you are (this obviously decreases with time and can be used as a proxy for the amount of reactant since it's a 1:1 reaction).

So you want to plot ln (Vn-Vt) against time. A first order reaction will give you a straight line

so does vt means the volume of n2 evolved at the specific time ( for example, the volume of nitrogen evolved at 3.5 minutes is 19.5 cm3)?

so Vn -Vt means the volume of nitrogen yet to be evolved at time t ?

but why (vn-vt) is plotted against time ? sorry i still don't get what is vn-vt . can you explain to me again?


thank you !