The composition of a mixture of potassium chlorate and potassium chloride is to be determined. A 9.23g sample of the mixture is heated until the creation of oxygen gas stops. If the sample mass after heating is 7.28g, what is the percent by mass of potassium chlorate in the mixture

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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".