Iron pyrites is roasted: $4\mathrm{FeS}{}_2+11\mathrm{O}{}_2\to 2\mathrm{Fe}{}_2\mathrm{O}{}_3+8\mathrm{SO}{}_2$. The volume of $\mathrm{O}{}_2$ at STP consumed per mole of $\mathrm{FeS}{}_2$ roasted is

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