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A particular reactant decomposes with a half-life of 189 s when its initial concentration is 0.257...

A particular reactant decomposes with a half-life of 189 s when its initial concentration is 0.257 M. The same reactant decomposes with a half-life of 189 s when its initial concentration is 0.753 M.
A) Determine the reaction order.
B) Calculate the rate constant.

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Answer #1

A) Determine the reaction order.
The order of reaction is zero because it only depends on the decomposition of reactive particularly different types of concentration so that is not a function of a catalyst.

The representation of [A] versus t gives a straight slope - k ordered in the
origin 0 [A].
These reactions occur in the case of heterogeneous reactions in which
reaction rate is independent of the concentration of reactants.

B) Calculate the rate constant.

t 1/2= [A]0/2K

k= [A]0/2t 1/2

k=[0.257]0/ 2* 189 s

k=6.79*10-4 M/s

...

k=[0.753]0/ 2* 189 s

k=1.99*10-3 M/s

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