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Moderate

Reaction Order

APCHEM-CLGKGJ

An experiment was performed to study the kinetics of the decomposition of Substance X. The concentration of X, $[X]$, was monitored over time as the reaction proceeded. The data are shown in the table above. The time interval between concentration measurements was 1.0 minute (60 s).

Time (s) [X] ln [X] $\frac { 1 }{ [X] }$
0 20.0 3.00 0.050
60 10.0 2.30 0.100
120 6.67 1.90 0.150
180 5.00 1.61 0.200
240 4.00 1.39 0.250

$\ $
Which of the following BEST describes the reaction?

A

The decomposition of Substance X is a zero-order reaction.

B

The decomposition of Substance X is a first-order reaction.

C

The decomposition of Substance X is a second-order reaction.

D

The decomposition of Substance X is a third-order reaction.