2. A sample of a substance containing only carbon, hydrogen, and oxygen has mass x in grams. It is burned and produces y grams of carbon dioxide and z grams of water. What is the empirical formula of the substance?    Leave your answer as a system of two equations in terms of constants (x, y, z), unknowns (a, b, c), and atomic masses from the periodic table. (no point in giving you numbers for x, y, z or having you do linear algebra – get used to variables!)    Hint: Write the chemical equation giving your carbohydrate subscripts a for C, b for H, and c for O.    Hint: Find the coefficients of this equation in terms of a, b, and c. For now, leave the coefficient of the hydrocarbon 1.    Hint: One equation will have ratios between the carbohydrate and carbon dioxide; the other, ratios between the carbohydrate and water.

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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".