# What is a first order half life graph?

${t}_{1 / 2} = \frac{\ln 2}{k}$
where $k$ is the first-order rate constant in ${\text{s}}^{- 1}$...
Apparently, this reactant has a half-life of $\text{100 s}$. How much time passes until one reaches the second half-life from time zero?