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A zero-order reaction has a constant rate of 3.20×10−4M/s. If after 45.0 seconds the concentration has...

A zero-order reaction has a constant rate of 3.20×10−4M/s. If after 45.0 seconds the concentration has dropped to 3.50×10−2M, what was the initial concentration?

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Answer #1

K   =1/t * [A0]-[A]

K = 3.2*10^-4 M = 0.00032M

[A]   = 3.5*10^-2M   = 0.035M

t   = 45second

K   =1/t * [A0]-[A]

K* t = [A0]-[A]

0.00032*45   = [A0]-0.035

0.0144          =[A0] -0.035

[A0]                = 0.0144+0.035

[A0]                  = 0.0494M

initial conc is 0.0494M

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