Under certain conditions the rate of this reaction is zero order in dinitrogen monoxide with a rate constant of $0\mathrm{.}0035M*s^{-1}$ :

$2N_{2}O(g)2N_2(g)+O_2(g)$

Suppose a $4\mathrm{.}0L$ flask is charged under these conditions with $100.$mmol of dinitrogen monoxide. How much is left $2\mathrm{.}0s$ later? You may assume no other

reaction is important.

Be sure your answer has a unit symbol, if necessary, and round it to $2$ significant digits.