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The molecular formula is the actual number of atoms in a molecule of a chemical compound. For example, the molecular formula of glucose is C6H12O6 but the empirical formula is the lowest ratio, CH2O . The molecular formula is always a multiple of the empirical formula.
Determining the Molecular Formula From Empirical Formula
Determining the Molecular Formula From Empirical Formula
First step is to find the empirical formula. Once that is knownwe must find the molar mass of that formula.
The empirical molar mass of CH2O is approximately 30g
You must be given the molecular molar mass in the problem. The second step is to divide the molecular molar mass by the empirical molar mass.
The molecular molar mass of glucose is approximately 180g. 180g ÷ 30g = 6
This means that the molecular molar mass is 6 times the emprical formula.
6x(CH2O) = C6H12O6
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