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【单选题】
In a given 1st order reaction A ---> products, the initial concentration of A is 0.40 M. What will be the concentration of A after 15 seconds if the half-life of the reaction is 3 seconds?A.
0.10 M
B.
8.0 x 10 -2 M
C.
1.25 x 10 -2 M
D.
2.66 x 10 -2 M
E.
2.5 x 10 -2 M
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