The sulfur content of an iron pyrite ore sample is determined by converting it to H2S gas, absorbing the H2S in?

10.0 mL of 0.00500 M I2, and then back-titrating the excess I2 with 0.00200 M Na2S2O3. If 2.6 mL Na2S2O3 is requiredfor the titration, how many milligrams of sulfur are contained in the sampleReactions:H2S + I2 → S + 2I? + 2H+I2 + 2 S2O32? → 2I? + S4O6