Ozone liberates iodine from acidified potassium iodide: $\mathrm{O}{}_3+2\mathrm{KI}+\mathrm{H}{}_2\mathrm{O}\to \mathrm{I}{}_2+2\mathrm{KOH}+\mathrm{O}{}_2$. The iodine liberated by an ozone sample required $28.0\mathrm{mL}$ of $0.0350\mathrm{M}$ $\mathrm{Na}{}_2\mathrm{S}{}_2\mathrm{O}{}_3$ for titration ($\mathrm{I}{}_2+2\mathrm{S}{}_2\mathrm{O}{}_3{}^{2-}\to 2\mathrm{I}{}^{-}+\mathrm{S}{}_4\mathrm{O}{}_6{}^{2-}$). Taking the molar volume at STP as $22.4\mathrm{L}\mathrm{mo}{\mathrm{l}}^{-1}$, the volume of ozone in the sample at STP is

1. A$21.95\mathrm{mL}$
2. B$5.49\mathrm{mL}$
3. C$10.98\mathrm{mL}$
4. D$7.32\mathrm{mL}$