Ethyl Mercaptan (C2H5SH) is a colorless or yellowish liquid or a gas with a pungent, garlic or skunk-like odor. The concentration of this compound was determined by shaking a 3.85 g sample with 58.00 mL of 0.01204 M lodine (12) in a tightly stoppered flask. The reaction is shown below. 2 C2H5SH + 12 → C2H5SSC2H5 + 2 1¯ + 2H* The excess 12 was back titrated with 19.86 mL of 0.01437 M Na2S2O3 according to the reaction: S406²-(aq) ²(aq) ➜ 21 ¹2(aq) + 2 S₂032- Calculate the percentage C₂H5SH (MW = 62.14 g/mol). (aq) +

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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".