A reaction in a batch system is assumed to be first order. Data listed below was collected. Determine the reaction rate constant.
chemical concentration (ug/L) time(min)
19.3 6
26.0 9
32.6 12
36.0 14
41.3 18
45.0 22
46.5 24
47.4 26
50.4 30
58.3 infinite