Historically, gaseous chlorine was produced by heating pyrolusite (manganese(IV)' dioxide, MnO2) in a solution of concentrated (excess) hydrochloric acid. The unbalanced reaction is shown below. HCI (aq) + MnO2 (s) H20 () + MnCl2 (aq) + Cl2 (g) How many grams of manganese(IV) dioxide are needed to produce 50.0 g of chlorine gas? 102.8 g O 6.4 g O44.6 g O 61.3 g

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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".