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rizzy81 rizzy81
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11 years ago
I know that there's some kind of factor that you have to multiply the empirical formula by but I was wondering you get it from the problem.
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wrote...
11 years ago
use the mole ratio
wrote...
11 years ago
Two experiments are required to arrive at the molecular formula for a compound.
1. Do an experiment to find the empirical formula
2. Do an experiment to find the molar mass.

Suppose one experiment gives an empirical formula of CH2. Suppose a second experiment reveals that the molar mass of the compound is 28 g/mol.

To find the molecular formula, simply divide the molar mass by the empirical formula mass. This should give a simple integer ratio, by which you then mulltiply the subscripts on the empirical formula.

For CH2, the empirical molar mass is 12 + 2 = 14 g/mol
28/14 = 2, so multiply the subscripts on the empirical formula to get the true molecular formula, which in this example gives C2H4.
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