Asample of a compound contains 0.150 mol C, 0.105 mole H, 0.0300 mol O, and 0.0450 mol N. The molecular mass of the compound is found to be 402 g/mol. What is the compound's chemical formula?
The chemical formula is
Step 1. Calculate the empirical formula.
The empirical formula is the simplest whole-number ratio of atoms in a compound.
The ratio of atoms is the same as the ratio of moles, so our job is to calculate the molar ratio of
I like to summarize the calculations in a table.
The empirical formula of the compound is
Step 2. Calculate the empirical formula mass
The molecular mass of
Step 3. Calculate the molecular mass.
The molecular mass must be an integral multiple multiple of the empirical formula mass.
Step 4. Calculate the Molecular Formula
The molecular formula must be twice the empirical formula.
The molecular formula is