Calculate how long it takes

Question

At a certain temperature the rate of this reaction is second order in NH₄OH with a rate constant of 0.012M^-1•s^-1

NH₄OH (aq) -> NH₃ (aq) + H₂O (aq)

Suppose a vessel contains NH₄OH at a concentration of 1.32M. Calculate how long it takes for the concentration of NH₄OH to decrease to 0.079M. You may assume no other reaction is important.

Round your answer to 2 significant digits.

Answer 1

Integrated rate law for 2nd order reaction is

1/[A] = 1/[A]_o + kt

Plug in the values that are given and solve for t