Chapter 14, Problem 14.71SP

The rearrangement of methyl isonitrile (CH₃NC) to acetonitrile (CH₃CN) is a first-order reaction and has a rate constant of $5.11\times {10}^{-5}{s}^{-1}\text{ at 472 K}\text{.}$
$C{H}_3-N\equiv C\to C{H}_3-C\equiv N$

If the initial concentration of CH₃NC is 0.0340 M:

1. What is the molarity Of CH₃NC after 2.00 h?
2. How many minutes does it take for the CH₃NC concentration to drop to 0.0300 M?
3. How many minutes does it take for 20%of the CH₃NCto react?