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The Empirical Formula
· The lowest whole number ratio of
elements in a compound.
· The molecular formula the actual ratio of
elements in a compound
· The two can be the same.
· CH2 empirical formula
· C2H4 molecular formula
· C3H6 molecular formula
· H O both…read more

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Calculating Empirical
· Just find the lowest whole number ratio
· C6H12O6
· CH4N
· It is not just the ratio of atoms, it is also the
ratio of moles of atoms
· In 1 mole of CO2 there is 1 mole of carbon
and 2 moles of oxygen
· In one molecule of CO2 there is 1 atom of
C and 2 atoms of O…read more

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Calculating Empirical
· Pretend that you have a 100 gram sample of the
compound.
· That is, change the % to grams.
· Convert the grams to mols for each element.
· Write the number of mols as a subscript in a
chemical formula.
· Divide each number by the least number.
· Multiply the result to get rid of any fractions.…read more

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Example
· Calculate the empirical formula of a
compound composed of 38.67 % C, 16.22
% H, and 45.11 %N.
· Assume 100 g so
· 38.67 g C x 1mol C = 3.220 mole C
12.01 gC
· 16.22 g H x 1mol H = 16.09 mole H
1.01 gH
· 45.11 g N x 1mol N = 3.219 mole N
14.01 gN…read more

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C3.22H16.09N3.219
· 3.220 mole C
· 16.09 mole H
· 3.219 mole N
·C3.22H16.09N3.219
If we divide all of these by the smallest
one It will give us the empirical formula…read more

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