Imagine a $43$ L tank of medical inhalation anesthetic gas that contains a mixture of $24\mathrm{.}8$ mol$\%$ N$2$O$,39\mathrm{.}5$ mol$\%$ N$2,10$ mol$\%$ desflurane and O$2$ at a total pressure of $213\mathrm{.}4$ atm.

$1.(1$ point$)$ What is the partial pressure of O$2,$ in atm, in the tank?