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An environmental engineer analyzes a sample of air contaminated with sulfur dioxide. To a 500. mL sample of air at 700. torr and 38°C, she adds 20.00 mL of 0.01017 M aqueous iodine, which reacts as follows:
2SO2(g) + I2(aq) + 2H2O(l) → 2HSO41-(aq) + 2I1-(aq) + 4H+(aq)
The excess I2(aq) left over from the above reaction was titrated with 11.37 mL of 0.0105 M thiosulfate (S2O32-) as follows: I2(aq) + 2S2O32-(aq) → 2I1-(aq) + S4O62-(aq)
What is the volume % of SO2 in the original air sample?

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