CHEM - Finding Empirical and Molecular Formulas
Chemistry, empirical formula, molecular formula - IGCSE | IBDP | DSE | GCE | AP Chemistry
Empirical formula: gives the simplest whole number ratio of atoms of each element in a compound
Molecular formula: gives the actual number of atoms of each element in a compound
Let's take a step-by-step look at how to determine the empirical and molecular formula of an unknown compound 😁
Find the molecular formula of a compound that has a molar mass of 92 g/mol and is composed of 30.4% nitrogen and 69.6% oxygen.
Step 1. Calculate the mass of each element of the compound. Assume you have 100 g of the compound.
In 100 g of the compound,
Step 2. Divide the mass of each element by its relative atomic mass to find the moles of each element.
A compound with the following composition has a molar mass of 60 g/mol: 39.97% carbon; 13.41% hydrogen; 46.62% nitrogen. Find the molecular formula.
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