I know the correct answer is B, but I do not understand why. Can you please expl

Question

I know the correct answer is B, but I do not understand why. Can you please explain how by looking at the graphs you can determine what the rate law is.

7· The rate of the reaction Y-Z YZ is studied much like in the crystal violet lab, except that both Y and - Z absorb visible light, thus their concentrations can both be measured directly in a spectrophotometer. In Trial 1, [Z] is held constant and Mis measured over time, producing the top three graphs. In Trial 2, D1 is held constant and [Z] is measured overF time, producing the bottom three graphs. Based on these graphs, the rate lawis: a. rate = k b. rate = k [Z] c. rate = k [Z] ie in the cystal iolet lab, eucept that both Y and time time time time

Explanation / Answer

Here the reaction is a first-order reaction, due to following reasons:

the graph of the natural logarithm ln [z] of a reactant concentration versus time, t is linear.

the graph of [Z] Vs time has a negative slope

hence the reaction must be a first-order reaction.

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