Molecular formulas give the actual number of atoms
- if you know the empirical formula, to find the molecular formula you need the molar mass
example
empirical formula - CH2O molar mass - 60.0g/mol Determine molecular formula
step 1 - find molar mass of CH2O (30.0g/mol)
step 2 - divide molar mass of molecular formula by molar mass of empirical (60.0/30.0 = 2)
step 3 - multiply all subscripts of the empirical formula by the answer (2)
molecular formula = C2H4O2
- JanCarlo Paysan
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