A reaction is second order in A with a rate constant of 0.039/ M s. The concentration of A was 0.30 M after 23 seconds. What was the initial concentration of A? Assume the stoichiometric coefficient for A is 1.

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k= 1/t [ 1/a-x -1/a ]a = initial conc , a-x = conc after 23 sec = 0.3M0.039 = 1/23 [1/0.3- 1/a]a = 0.41 M = initial conc of A

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