Question

Визначте молекулярну формулу насиченого вуглеводню густина якого за воднем 36. Наведіть структурні формули двох гомологів цього вуглеводню.

Answer 1

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Answer 2

Molecular Formula and Density of a Saturated Hydrocarbon with a Molar Mass of 36 g/mol

To determine the molecular formula of a saturated hydrocarbon with a molar mass of 36 g/mol and a density greater than water, we need to consider the relationship between molar mass, molecular formula, and density.

The molar mass of a compound is the sum of the atomic masses of all the atoms in its molecular formula. The density of a substance is the mass per unit volume. In this case, we are given that the density of the hydrocarbon is greater than water, which has a density of 1 g/mL.

To find the molecular formula, we need to consider the possible combinations of elements that can result in a molar mass of 36 g/mol. One possible combination is a hydrocarbon with two carbon atoms and six hydrogen atoms.

The molar mass of two carbon atoms is 24 g/mol (12 g/mol per carbon atom), and the molar mass of six hydrogen atoms is 12 g/mol (2 g/mol per hydrogen atom). Therefore, the molar mass of this hydrocarbon is 36 g/mol, which matches the given molar mass.

Structural Formulas of Two Homologues of the Saturated Hydrocarbon

The structural formula of a compound shows the arrangement of atoms and bonds in the molecule. For the hydrocarbon with a molar mass of 36 g/mol, two possible homologues can be considered based on the number of carbon atoms.

1. Ethane (C2H6): Ethane is a saturated hydrocarbon with two carbon atoms and six hydrogen atoms. Its structural formula is:

   H   H
    \ /
     C
     |
     C
    / \
   H   H
   

2. Propane (C3H8): Propane is another saturated hydrocarbon with three carbon atoms and eight hydrogen atoms. Its structural formula is:

   H   H   H
    \ / \ /
     C   C
     |   |
     C   C
    / \ / \
   H   H   H
   

These are two examples of homologues of the saturated hydrocarbon with a molar mass of 36 g/mol. Homologues are compounds that belong to the same series and have similar chemical properties but differ in the number of repeating units (in this case, carbon atoms) in their molecular formula.

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