Noble Gas. Metals have 1 or 2 Valence Electrons. Halogens have 7 Valence Electrons. Semi-Metals can have different amounts.
The mass sample of nicotine combusted = 2.625 mg (given)
Mass of
produced = 7.1210 mg (given)
Mass of
produced = 2.042 mg (given)
Molar mass of
= 44 g/mol
Molar mass of
= 18 g/mol
Percentage of Carbon =
%
Percentage of hydrogen =
%
Now, for percentage of nitrogen =
%
Calculating the moles of each element:

- For


- For


- For


Dividing with the smallest mole value to calculate the molar ratio of each element:



Hence, the empirical formula for nicotine is
.
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