You have a of 5.0 g sample of vinegar is titrated with 0.250 M NaOH.So If the vinegar requires  25.5 mL of the NaOH solution for complete reaction, what is the % by mass of HC2H3O2 in the vinegar? HC2H3O2 (aq) + NaOH (aq) ---> NaC2H3O2 + H2O (l)

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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".