EMPIRICAL FORMULA-GENERAL CHEMISTRY, Exercises of Chemistry

Download EMPIRICAL FORMULA-GENERAL CHEMISTRY and more Exercises Chemistry in PDF only on Docsity! Molecular Formula Worksheet Molecular formula – a formula showing the types and numbers of atoms combined in a single molecule of a molecular compound. It is a whole number multiple of the empirical formula. The relationship between a compound’s empirical and molecular formula can be written as: x(empirical formula) = molecular formula also x(empirical formula mass) = molecular formula mass 1. To determine the molecular formula of a compound, you must know the compound’s molar mass. 2. Divide the molecular mass by the empirical formula mass to determine the whole number multiple (x). You may have to find the empirical formula in order to obtain the empirical formula mass. Problems: 1. In a previous problem, the empirical formula of a compound of phosphorus and oxygen was found to be P2O5. Experimentation shows that the molar mass of this compound is 283.89g/mol. What is the compounds molecular formula? 2. Determine the molecular formula of the compound with an empirical formula of CH and a molar mass of 78.110 g/mol. 3. A sample with a molar mass of 34.00 g/mol is found to consist of 0.44g H and 6.92g O. Find its molecular formula.