# Stoichiometry : Empirical & Molecular Formulas Quiz

Quiz
*Theme/Title: Empirical & Molecular Formulas
* Description/Instructions
An empirical formula is the simplest whole-number ratio of a molecular formula. The EF may or may not be the same as the MF. Data used to determine the EF may be the masses of or percentages elements that comprise the compound. If the percentages are given, you may assume that there is 100 grams of the compound provided, and the percentages are equal to the masses of the elements. Convert these into moles by dividing by the molar mass, and then divide that number by the smallest value to get the ratio. To get the molecular formula, you must divide the molar mass of the empirical formula into the given molecular formula mass to find the multiplier. Then multiply that number by the EF to get the MF. To complete this quiz, you must have a periodic table and a calculator. This quiz covers simple empirical and molecular formula calculations.

Group: Chemistry Chemistry Quizzes
Topic: Stoichiometry

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