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A first-order reaction A⟶B has the rate constant k= 3.2×10−3 s^−1 . If the initial concentration...

A first-order reaction A⟶B has the rate constant k= 3.2×10−3 s^−1 .

If the initial concentration of A is 1.5×10−2 M, what is the rate of the reaction at t= 620 s ?

Express your answer to two significant figures and include the appropriate units.

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Answer #1

rate constant k = 3.2 x 10^-3 s-1

initial concentration Ao = 1.5 x 10^-2 M

time t = 620 sec

k = 1/t ln (Ao / At)

3.2 x 10^-3 = 1/ 620 ln (1.5 x 10^-2 / At)

At = 2.06 x 10^-3 M

rate = k [A]

      = 3.2 x 10^-3 x (2.06 x 10^-3)

rate = 6.6 x 10^-6 M/s

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