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Empirical Formula

Monday, January 10, 2011 /7:47 PM

Empiricial Formula

empirical formulas are the simplest formula of a compound
show only the simpliest ratios, not the actual atoms

-the empirical formula for chlorine gas is Cl
-Dinitrogen tetraoxide ≠ N₂0₄= NO₂

example

a sample of an unknown compound is found to contain 8.5g of "N", 2.2g of "H" and 5.5g of "O". Determine the empirical formula.

Molecular Formula

-give the actual number of atoms

to determine the empirical formula we need to know the ratio of each element
to determine the ratio, fill in the table below for each problem:

example:

a sample of an unknown compound is found to contain 8.5g of "N", 2.2g of "H", and 5.5g of "O". Determine the empirical formula.

N₂H₆O

the simplest ratio may be decimals. For certain decimals you need to multiply everything by a common number.

http://www.youtube.com/watch?v=gfBcM3uvWfs

Molecular formulas

If you know an empirical formula to find the molecular formula you need the molar mass.

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