The composition of a hydrocarbon with an amount of a substance of 4 mol includes 1.2 10 ^ 25 carbon atoms

| July 22, 2021 | education

The composition of a hydrocarbon with an amount of a substance of 4 mol includes 1.2 10 ^ 25 carbon atoms and 2.88 10 ^ 25 hydrogen atoms. Determine the molecular formula of the hydrocarbon, draw up the structural formula of an isomer of this composition having a quaternary carbon atom, name it.

To find out the number of atoms in one molecule, it is necessary to divide the total number of atoms in an element by Avogadro’s number and
number of moles. Then it turns out for carbon: 1.2 10 ^ 25: 6 * 10 ^ 23: 4 = (120: 6): 4 = 5. For hydrogen: 2.88 *
10 ^ 25: 6 * 10 ^ 23: 4 = (288: 6): 4 = 12.
The obtained hydrocarbon formula, C5H12, is pentane, the isomer of which can be H3C-C (CH3) 2-CH3 2,2-dimethyl-propane,
having a quaternary carbon atom in the middle of the molecule.



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