Molecular Formula 2
Molecular Formula: The actual formula for a molecule.
A compound is 75.46% carbon, 4.43% hydrogen, and 20.10% oxygen by mass. It has a molecular weight of 318.31 g/mol. What is the molecular formula for this compound?
Get the mass of each element by assuming a certain overall mass for the sample (100 g is a good mass to assume when working with percentages).
Convert the mass of each element to moles.
Find the ratio of the moles of each element.
Use the mole ratio to write the empirical fomula.
Find the mass of the empirical unit.
Figure out how many empirical units are in a molecular unit.
Write the molecular formula.
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