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Question

A reaction is found to be 0th order with respect to chlorate ion. If the initial concentration of chlorate ion is 0.883M and the rate law constant is 0.0193 M/sec, what will the concentration of chlorate ion be after 22.7 seconds have passed? (show steps)

Answer 1

The units of the rate constant tell us the order of the overall reaction. Since the units are M/s, this tells us the overall reaction is zero order.

The integrated rate law for a zero order reaction is

[A] = [A]_o - kt

Solving for [A] when t = 22.7 seconds, we have ..

[A] = 0.883 M - 0.0193 M/s(22.7 s)

[A] = 0.883 M - 0.438 M

[A] = 0.445 M = [chlorate ion]