The Empirical formula gives the lowest term ratio of atoms (or moles) in the formula.
All Ionic compounds are empirical formula.
A compound contains 80% C and 20 % H?
What is its empirical formula?
*Assume you have 100 g
80.0 g of C x 1 mole/ 12.0 g = 6.6666 mol
20.0 g of H x 1 mole/1 = 20.0 mol
Divide by smallest mole amount
20.0/6.6666= 3
6.6666/6.6666=1
= ratio of C to H is 1 to 3 = CH3
Here are some examples to help you!!!1
http://www.chem.tamu.edu/class/majors/tutorialnotefiles/empirical.htm
A great video!!!
http://www.youtube.com/watch?v=FWozjZ20JyA
Enjoy!!!
Chapter test is December 7, 2010
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