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Calculating Average Reaction Rate

CHEM-ONUWDV

The following data were collected for the reaction $A \rightarrow \text{products}$:

Time (s) [A] (M)
0.0 0.450
30.0 0.268
60.0 0.160
90.0 0.095

$\ $
Calculate the rate of change of $A$ over the time interval 30.0 s - 60.0 s in $\frac{M}{s}$.