Chlorine can be prepared in the laboratory by the reaction of manganese dioxide with hydrochloric acid, HCl(aq), as described by the chemical equation MnO₂ (s) + 4 HCl(aq) → MnCl₂(aq) + 2H₂O(l) + Cl₂(g) How much MnO₂ (s) should be added to excess HCl(aq) to obtain 395 mL Cl₂(g) at 25 °C and 805 Torr? mass of MnO₂: 2

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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".