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Calculating the Rate of Reaction

CH3OH + HCl > CH3Cl + H2O

The above is a chemical reaction. Below are data, time intervals and levels of concentration that it takes for HCl to react.

Time (min) HCl (M)

0 1.85
79 1.67
158 1.52
316 1.30
632 1.00

How do you calculate the average rate of reaction for the time interval between each measurement? When reviewing this problem as it appears to you, please note that the data actually are two separate columns where in the first row 0 = minutes and 1.85 is M HCl the same is true for the remaining rows of data.

Solution Summary

The solution is given in an attachment in 150-200 words.