3. A 4.326 g sample containing ethyl mercaptan (C₂H_SH) was treated with 50.00 mL of 0.1287 M 1₂ in a sealed flask. When the reaction is complete, the excess I₂ was back-titrated with 18.05 mL of 0.1424 M Na₂S₂O3. Calculate the percentages of C H SH in the sample. L+2C₂H₂SH →21+ C₂H5SSC₂H5 +2H*

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Stoichiometry

Stoichiometry is a chemical division that evaluates the quantitative content of the chemical process with the help of the reacting molecules or products taking part in the reaction. The term “stoicheion” in “Stoichiometry”, is an old Greek term for "element" whereas “metron” means "measure".