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.

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.

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.

C5H10​

C5H10

Explanation:

The hydrocarbon contains five carbon atoms and ten hydrogen atoms

definition

                    entropy is a measure of the randomness or the extent of disorder of a chemical process.

                      enthalpy is a measure of the heat change of a reaction occurring at a constant pressure.

measurement units:

                        entropy is measured in joule per kelvin (jk⁻¹)   whereas enthalpy is measured in joule per mole (jmol⁻¹)

requirements:

                            entropy has no requirements or limits, and its change is measured by the division between the heat change of the chemical process and the temperature.

                              in contrast, enthalpy can only be related to the heat change of the reaction under standard conditions.

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the atomic number of carbon is six, which means that a carbon atom has six protons. carbon has three naturally occurring isotopes: carbon-12, carbon-13, and carbon-14. which of these statements are true about carbon and its isotopes? select all that appl