Consider the following reaction between sulfur trioxide and water: SO3 (9) + H₂O (1)→ H₂SO4 (aq) A chemist allows 61.5 g of SO3 and 11.2 g of H₂O to react. When the reaction is finished, the chemist collects 51.3 g of H₂SO4.

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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".