The rate constant for this zero‑order reaction is 0.0330 M·s−1 at 300 ∘C. A⟶products How long (in seconds) would it take for the concentration of A to decrease from 0.750 M to 0.270 M?

Answer 1

A zero- order reaction is one where the rate is constant (not dependent on concentration).

The change in molarity is 0.750 - 0.270 = 0.480 M. The rate constant is 0.0330 M/s, the reciprocal of which is

1/ 0.0330 s/M. Multiply the reciprocal by the change in molarity to get the number of seconds.

1/0.0330 s/M x 0.480M = 14.5 seconds