I don\'t know which one it is? How do you work it out? Consider the reaction bet

Question

I don't know which one it is? How do you work it out?

Consider the reaction between substance A and substance B: A + B rightarrow products. The rate law for the reaction is first order in substance A and first order in substance B. The graph above shows how the reaction rate varies with concentration of substance A in experiments where the concentration of substance B is 0.255 mol L^-1. Which of the following is equal to the rate constant for the reaction? 0.349 L mol-^1 s^-1 2.86 L mol^-1 s^-1 1.37 L mol^-1 s^-1 3.92 L mol^-1 s^-1 0.730 L mol^-1 s^-1 5.33 L mol^-1 s^-1

Explanation / Answer

calculate slope of graph first

slope = change in y / change in x

= (0.300 - 0) molL-1s-1 / (0.400-0) molL-1

= 0.750 s-1

Now the rate law for the reaction is:

rate= k [A] [B]

since the graph is between rate and [A],

slope = k*[B]

so,

k*[B] = 0.750 s-1

k*0.255 mol.L-1 = 0.750 s-1

K = 2.94 Lmol-1s-1

The closest is 2.86 Lmol-1s-1

The little difference is because, I can't hover my mouse on graph to see the points

go for this

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