graph rate law based on these three graphs from each trial? I\'m not too sure ab

Question

graph rate law

based on these three graphs from each trial? I'm not too sure about what a rate law is and how I can determine is based on graphs while certain variables are held constant? please help.

3. The rate of the reaction Y Z Yi this lab, excep that both Y and Z ab ble light, thus, their concentra- ians can both be measured directly in spectrophotometer. In trial 1.CZI is held constant and is measured over time, producing the top three graphs In trial 2, M is held constant and is mea- producing the bottom three graphs. Based ese graphs, write the rate law for CHM 230 Lab 2 17

Explanation / Answer

integrated rate law for 1st order reaction:
ln [A] = –kt + ln [A]o
so, for 1st order reaction ln A vs t should be linear
Which is the case for Y
Hence order of Y is 1

integrated rate law for 2nd order reaction:
1/[A]o = 1/[A] - k*t
so, for 2nd order reaction 1/[A] vs t should be linear
Which is the case for Z
Hence order of Z is 2

rate law is:
rate = k [Y] [Z]^2

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