HELP!! Derivation of the chemical formula of a compound 1. The organic compound contains 84.21% carbon and 15.79% hydrogen.

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HELP!!
Derivation of the chemical formula of a compound

1. The organic compound contains 84.21% carbon and 15.79% hydrogen. The vapor density of the compound in air is 3.93. Formulate the molecular formula of the compound.

Answer: C8H18

2. The hydrocarbon contains 83.72% carbon and 16.28% hydrogen. Formulate its molecular formula if the vapor mass of 1 liter (n.s) of this compound is known to be 3.84.

Answer: C5H10

3. The compound contains 85.71% carbon and 14.29% hydrogen. The vapor density of the compound according to chlorine is 0.986. Formulate its molecular formula.

Answer: C5H10​

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