The mass fraction of carbon in the diamine is 48.65%. The mass fraction of nitrogen is 37.84%. Derive the molecular formula of diamine.

The general formula of diamines is СnН2n (NH2) 2
28 / (12n + 2n + 16×2) = 0.3784
⇔ 5.2976n + 12.1088 = 28
⇔ n = 3
Answer: The molecular formula of diamine is C3H6 (NH2) 2.

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