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A chemical reaction that is first-order in X is observed to have a rate constant of...

A chemical reaction that is first-order in X is observed to have a rate constant of 2.1 × 10-2s-1. If the initial concentration of X is 1.0 M, what is the concentration of X after 195 s?

A.

0.017 M
B.

0.59 M
C.

0.98 M
D.

0.20 M
E.

60 M
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