Derive the molecular formula of an amine, in which the mass fraction of carbon is 77.42%, nitrogen is 15.05%, hydrogen is 7.53%.
Let us write the unknown formula of the amine as CxNyHz.
Let’s write the expression as a ratio of percentage and molar mass.
CxNyHz = 74.42 / 12: 15.05 / 14: 7.53 / 1 = 6.02: 1.075: 7.53.
Convert to integers by dividing all values by the smallest.
CxNyHz = 6: 1: 7.
The resulting gross formula C6NH7 or C6H2NH2 is aniline, the simplest aromatic amine. Poisonous.
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