For A --> products, time and concentration data were collected and plotted as shown.

Question

For A --> products, time and concentration data were collected and plotted as shown.

[A] (M) t (s)

0.850 0.00

0.611 30.0

0.439 60.0

0.316 90.0

Determine the reaction order

the rate constant and the units.

Answer 1

Considering the nature of graphs to be of the first order,

For the Rate constant,

k = 2.303/t x log A₀/A_t

k = 2.303/30.0 x log 0.850/0.611

k = 0.011 s^-1

therefore, the unit of the rate constant is s^-1

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