An unknown solid white mixture is composed of an unknown (and unreactive) solid and potassium chlorate. When heated, the potassium chlorate decomposes into potassium chloride and oxygen gas, but the unknown (and unreactive) solid does not decompose. A student heats 1.995 g of an unknown mixture, and upon heating, 1.644 g of solid are isolated. Write a balanced equation for the decomposition of potassium chlorate. 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".