# Problem: An environmental engineer analyzes a sample of air contaminated with sulfur dioxide. To a 500.-mL sample at 700. torr and 38°C, she adds 20.00 mL of 0.01017 M aqueous iodine, which reacts as follows:SO2(g) + I2(aq) + H2O(l) ⟶ HSO4−(aq) + I−(aq) + H+(aq) [unbalanced]Excess I2 reacts with 11.37 mL of 0.0105 M sodium thiosulfate:I2(aq) + S2O32−(aq) ⟶ I−(aq) + S4O62−(aq) [unbalanced]What is the volume % of SO2 in the air sample?

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###### Problem Details

An environmental engineer analyzes a sample of air contaminated with sulfur dioxide. To a 500.-mL sample at 700. torr and 38°C, she adds 20.00 mL of 0.01017 M aqueous iodine, which reacts as follows:

SO2(g) + I2(aq) + H2O(l) ⟶ HSO4(aq) + I(aq) + H+(aq) [unbalanced]

Excess I2 reacts with 11.37 mL of 0.0105 M sodium thiosulfate:

I2(aq) + S2O32−(aq) ⟶ I(aq) + S4O62−(aq) [unbalanced]

What is the volume % of SO2 in the air sample?