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The decomposition reaction X → products was studied as a function of time. Data are given...

The decomposition reaction X → products was studied as a function of time. Data are given in the table below.

time / s [X] / mol L−1
0 (exactly) 1.650
1.62×103 1.102
3.23×103 0.7382
4.85×103 0.4932
6.46×103 0.3303

What is the value of the rate constant?
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