A solution is created by dissolving oxygen in water at $20\backslash$deg C$.$ If the concentration of oxygen in the water is $5\mathrm{.}0$ x $10-3$ m$,$ what is the partial pressure $($atm$)$ of the oxygen gas above the solution? Henry's law constant for oxygen at $20\backslash$deg C is $1\mathrm{.}43$ x $10-3$m$/$atm$.$ Enter your answer with no units.