![]() Mass of crucible + potassium = 28.709 grams He recorded the following data on his notebook. Q2) A student was performing some gravimetric analysis in his chemistry lab. (Answers: a) NH 2, b) MgCl 2, c) C 2H 5NO) Test Yourself by calculating the empirical formulae from the data provided in the following set of questions. Result: The numerical values obtained gives the simplest whole number mole ratio thus the empirical formula for the compound under investigation is C 7H 7NO 2. If the molecular formula of the compound is already known, we can find its empirical formula just by dividing the number of atoms of each element with a whole number such that we obtain the simplest integer values. This is the simplest example of determining an empirical formula. The calculation depends on the information provided.Ĭase 1: Molecular formula of a compound is given If we know which elements are present in a molecule and in what ratio, we can calculate the molecule’s empirical formula. How to calculate empirical formulaĪn empirical formula can be calculated through chemical stoichiometry. For example, the molecular formula for octane is C 8H 18 while its empirical formula is C 4H 9.If the molecular formula for an organic compound, dodecane is C 12H 26, can you determine its empirical formula? It is C 6H 13.
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