At a certain temperature the rate of this reaction is first order in HI with a rate constant of $0\mathrm{.}00152$ s$^-1$: $2$HI$($g$)=$H$2($g$)+$I$2($g$)$

Suppose a vessel contains HI at a concentration of $1\mathrm{.}41$ M$.$ Calculate the concentration of HI in the vessel $420\mathrm{.}0$ seconds later. You may assume no other reaction is important.

Round your answer to $2$ significant digits.