A poisonous compound cadavenine has 58.77% C, 13.81% H and 27.42% N. Its molar mass is 102 g/mol. Determine its molecular formula.

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Solution

Let the formula be $C x H y N z$
For $C ⟹ 12 \times x = \frac{102 \times 58.77}{100}$
$⟹ x = 5$
For $H ⟹ 1 \times y = \frac{102 \times 13.81}{100}$
$⟹ y = 14$
For $N ⟹ 14 \times z = \frac{102 \times 27.42}{100}$
$⟹ z = 2$
Formula: $C_{5} H_{14} N_{2}$

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