Empirical Formula - A formula that gives the simplest whole-number ratio of atoms in a compound.
the moles of each element are known, a stoichiometric comparison between the elements can be made to determine the empirical formula. This is achieved by dividing through each of the mole quantities by which ever mole quantity is the smallest number of moles. In this example, the smallest mole quantity is either the moles of carbon or moles of Oxygen
0.105/0.0300 = 3.5 C x 2 = 7 C
0.105/0.0300 = 3.5 H x 2 = 7 H
0.0300/0.0300 = 1 O x 2 = 2 O
0.0450/0.0300 = 1.5 N x 2 = 3 N
Multiply by 2 to get whole numbers
Empirical formula is C7 H7 O2 N3
Subscript on H is thus 7
Hope you understand.
May 11th, 2015
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