3. A 5.000 g sample of an organic compound containing C, H, and O atoms was combusted and produced 14.26 g CO2 and 3.335 g H2O. Its molar mass is 108.1 g/mol. a. What is the mass percent composition of C, H, and O in the compound? b. What is the empirical formula of the compound? C. What is the molecular formula of the compound? 4. A 8.129 g sample of MgSO4 · x H20 was heated until all of the water of hydration is removed. The resulting anhydrous compound weighs 3.967 g. a. What is the formula of the hydrate? b. If the label of a reagent bottle containing the hydrate indicates that it has 99.5% purity, how many moles of the hydrate is present in a 70.5 g of the hydrate?

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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".